Questions — Edexcel (9685 questions)

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Edexcel M1 Q5
13 marks Standard +0.3
  1. Two model cars \(A\) and \(B\) have masses 200 grams and \(k\) grams respectively. They move towards each other in a straight line and collide directly when their speeds are \(5 \mathrm {~ms} ^ { - 1 }\) and \(4 \mathrm {~ms} ^ { - 1 }\) respectively. As a result the speed of \(A\) is reduced to \(2 \mathrm {~ms} ^ { - 1 }\), in the same direction as before. The direction of \(B\) 's motion is reversed and its speed immediately after the impact is \(5 \mathrm {~ms} ^ { - 1 }\).
    1. Find the magnitude of the impulse exerted by \(A\) on \(B\) in the impact. State the units of your answer.
    2. Find the value of \(k\).
    The surface on which the cars move is rough, and \(B\) comes to rest 3 seconds after the impact. The coefficient of friction between both cars and the surface is \(\mu\).
  2. Find the value of \(\mu\).
  3. Find the distance travelled by \(A\) after the impact before it comes to rest.
Edexcel M1 Q6
15 marks Standard +0.3
6. A small ring, of mass \(m \mathrm {~kg}\), can slide along a straight wire which is fixed at an angle of \(45 ^ { \circ }\) to the horizontal as shown. The coefficient of friction between the ring and the wire is \(\frac { 2 } { 7 }\).
The ring rests in equilibrium on the wire and is just prevented from \includegraphics[max width=\textwidth, alt={}, center]{cc75a4a5-1c3a-4e36-acfd-21f6246f2a38-2_273_296_1192_1617}
sliding down the wire when a horizontal string is attached to it, as shown
  1. Show that the tension in the string has magnitude \(\frac { 5 m g } { 9 } \mathrm {~N}\). The string is now removed and the ring starts to slide down the wire.
  2. Find the time that elapses before the ring has moved 10 cm along the wire.
Edexcel M1 Q7
15 marks Standard +0.8
7. Two cyclists, Alice and Bobbie, travel from \(P\) to \(Q\) along a straight path. Alice starts from rest at \(P\) just as Bobbie passes her at \(3.5 \mathrm {~ms} ^ { - 1 }\). Bobbie continues at this speed while Alice accelerates at \(0.2 \mathrm {~ms} ^ { - 2 }\) for \(T\) seconds until she attains her maximum speed. At this moment both cyclists immediately start to slow down, with constant but different decelerations, and they come to rest at \(Q 80\) seconds after Alice started moving.
  1. Sketch, on the same diagram, the velocity-time graphs for the two cyclists. By using the fact that both cyclists cover the same distance, find
  2. the value of \(T\),
  3. the distance between \(P\) and \(Q\),
  4. the magnitude of Bobbie's deceleration.
Edexcel M1 Q1
3 marks Moderate -0.3
  1. A car accelerates from 0 to \(108 \mathrm {~km} \mathrm {~h} ^ { - 1 }\) in 7.5 seconds. Find its acceleration in \(\mathrm { ms } ^ { - 2 }\). ( 3 marks)
  2. A book rests on a rough desk-lid which is hinged at one end. When the lid is raised so that it makes an angle of \(15 ^ { \circ }\) with the horizontal, the book is just on the point of sliding down a line of greatest slope. Modelling the book as a particle, find
    1. the coefficient of friction between the book and the desk-lid,
    2. the acceleration with which the book starts to move if it is released from rest when the lid is inclined at \(20 ^ { \circ }\) to the horizontal.
    3. A particle \(P\) is projected vertically upwards from ground level at time \(t = 0\) with speed 20 \(\mathrm { ms } ^ { - 1 }\). Two seconds later another particle \(Q\) is projected vertically upwards with speed 30 \(\mathrm { ms } ^ { - 1 }\) from a point on the same horizontal ground.
    4. Taking the upward direction as positive, write down expressions in terms of \(g\) and \(t\) for the velocities of \(P\) and of \(Q\) at time \(t\) seconds after \(P\) is projected.
    5. Find the value of \(t\) when both particles are moving with the same speed.
    6. A jet of water issues from a cylindrical pipe with a circular cross-section of radius \(2 \cdot 75 \mathrm {~cm}\). The water strikes a vertical wall at a speed of \(9 \mathrm {~ms} ^ { - 1 }\). Taking the density of water to be \(1000 \mathrm {~kg} \mathrm {~m} ^ { - 3 }\), calculate
    7. the momentum destroyed each second by the impact with the wall,
    8. the magnitude of the force exerted by the water on the wall.
    9. State one modelling assumption that you have made.
    10. Two particles \(A\) and \(B\), of mass 1 kg and \(m \mathrm {~kg}\) respectively, where \(m > 1\), are attached to the ends of a light inextensible string which passes over a small fixed smooth pulley. The particles are released from rest and move with the string taut and vertical.
    11. Show that the acceleration of the system is equal to \(\frac { ( m - 1 ) g } { m + 1 }\).
    12. Find the tension in the string, in terms of \(m\) and \(g\), expressing your answer as a single algebraic fraction in its simplest form.
    When the system is released from rest, both particles are \(52 \cdot 5 \mathrm {~cm}\) above ground level and 60 cm below the level of the pulley. \(B\) hits the ground after half a second.
  3. Find the value of \(m\).
  4. Find the speed with which \(B\) hits the ground. \section*{MECHANICS 1 (A) TEST PAPER 9 Page 2}
Edexcel M1 Q6
17 marks Standard +0.3
  1. At noon, two boats \(P\) and \(Q\) have position vectors \(( \mathbf { i } + 7 \mathbf { j } ) \mathrm { km }\) and \(( 3 \mathbf { i } - 8 \mathbf { j } ) \mathrm { km }\) respectively relative to an origin \(O\), where \(\mathbf { i }\) and \(\mathbf { j }\) are unit vectors in the directions due East and due North respectively. \(P\) is moving with constant velocity \(( 3 \mathbf { i } - 4 \mathbf { j } ) \mathrm { km } \mathrm { h } ^ { - 1 }\) and \(Q\) is moving with constant velocity \(( 6 \mathbf { i } + 5 \mathbf { j } ) \mathrm { km } \mathrm { h } ^ { - 1 }\).
    1. Find the position vector of each boat at time \(t\) hours after noon, giving your answers in the form \(\mathrm { f } ( t ) \mathrm { i } + \mathrm { g } ( t ) \mathrm { j }\), where \(\mathrm { f } ( t )\) and \(\mathrm { g } ( t )\) are linear functions of \(t\) to be found.
    2. Find, in terms of \(t\), the distance between the boats \(t\) hours after noon.
    3. Calculate the time when the boats are closest together and find the distance between them at this time.
    4. A particle starts from rest and accelerates at a uniform rate over a distance of 12 m . It then travels at a constant speed of \(u \mathrm {~ms} ^ { - 1 }\) for a further 30 seconds. Finally it decelerates uniformly to rest at \(1.6 \mathrm {~ms} ^ { - 2 }\).
    5. Sketch the velocity-time graph for this motion.
    6. Show that the total time for which the particle is in motion is
    $$\frac { 5 u } { 8 } + 30 + \frac { 24 } { u } \text { seconds. }$$
  2. Find, in terms of \(u\), the total distance travelled by the particle during the motion.
  3. Given that the total time for the motion is \(39 \cdot 5\) seconds, show that \(5 u ^ { 2 } - 76 u + 192 = 0\).
  4. Find the two possible values of \(u\) and the total distance travelled in each case.
Edexcel M1 Q1
7 marks Moderate -0.3
  1. A boy holds a 30 cm metal ruler between three fingers of one hand, pushing down with the middle finger and up with the other two, at the points marked \(5 \mathrm {~cm} , 10 \mathrm {~cm}\) \includegraphics[max width=\textwidth, alt={}, center]{88b98fe3-7952-44e4-8a8e-5f6f8813fbcc-1_197_556_354_1371}
    and \(x \mathrm {~cm}\) and exerting forces of magnitude \(11 \mathrm {~N} , 18 \mathrm {~N}\) and 8 N respectively. The ruler is in equilibrium in this position. Modelling the ruler as a uniform rod, find
    1. the mass of the ruler, in grams,
    2. the value of \(x\).
    3. State how you have used the modelling assumption that the ruler is a uniform rod.
    \includegraphics[max width=\textwidth, alt={}, center]{88b98fe3-7952-44e4-8a8e-5f6f8813fbcc-1_182_372_1000_367}
    A small packet of mass 0.3 kg rests on a rough horizontal surface. The coefficient of friction between the packet and the surface is \(\frac { 1 } { 4 }\). Two strings are attached to the packet, making angles of \(45 ^ { \circ }\) and \(30 ^ { \circ }\) with the horizontal, and when forces of magnitude 2 N and \(F \mathrm {~N}\) are exerted through the strings as shown, the packet is on the point of moving in the direction \(\overrightarrow { A B }\).
    Find the value of \(F\).
Edexcel M1 Q3
7 marks Moderate -0.8
3. A body moves in a straight line with constant acceleration. Its speed increases from \(17 \mathrm {~ms} ^ { - 1 }\) to \(33 \mathrm {~ms} ^ { - 1 }\) while it travels a distance of 250 m . Find
  1. the time taken to travel the 250 m ,
  2. the acceleration of the body. The body now decelerates at a constant rate from \(33 \mathrm {~ms} ^ { - 1 }\) to rest in 6 seconds.
  3. Find the distance travelled in these 6 seconds.
Edexcel M1 Q4
12 marks Standard +0.3
4. A particle \(P\) of mass \(m \mathrm {~kg}\), at rest on a smooth horizontal table, is connected to particles \(Q\) and \(R\), of mass 0.1 kg and 0.5 kg respectively, by strings which pass over fixed pulleys at the edges of the table. The system is released from rest with \(Q\) and \(R\) hanging freely and it is found that the tension in the section of the string between \(P\) and \(R\) is 2 N .
  1. Show that the acceleration of the particles has magnitude \(5 \cdot 8 \mathrm {~ms} ^ { - 2 }\).
  2. Find the value of \(m\). Modelling assumptions have been made about the pulley and the strings.
  3. Briefly describe these two assumptions. For each one, state how the mathematical model would be altered if the assumption were not made. \section*{MECHANICS 1 (A)TEST PAPER 10 Page 2}
Edexcel M1 Q5
12 marks Moderate -0.3
  1. Two trucks \(P\) and \(Q\), of masses 18000 kg and 16000 kg respectively, collide while moving towards each other in a straight line. Immediately before the collision, both trucks are travelling at the same speed, \(u \mathrm {~ms} ^ { - 1 }\). Immediately after the collision, \(P\) is moving at half its original speed, its direction of motion having been reversed.
    1. Find, in terms of \(u\), the speed of \(Q\) immediately after the collision.
    2. State, with a reason, whether the direction of \(Q\) 's motion has been reversed.
    3. Find, in terms of \(u\), the magnitude of the impulse exerted by \(P\) on \(Q\) in the collision, stating the units of your answer.
    The force exerted by each truck on the other in the impact has magnitude \(108000 u \mathrm {~N}\).
  2. Find the time for which the trucks are in contact.
Edexcel M1 Q6
13 marks Moderate -0.8
6. A particle \(P\) moves in a straight line such that its displacement from a fixed point \(O\) at time \(t \mathrm {~s}\) is \(y\) metres. The graph of \(y\) against \(t\) is as shown.
  1. Write down the velocity of \(P\) when
    1. \(t = 1\),
    2. \(t = 10\).
      (2 marks)
  2. State the total distance travelled by \(P\).
    (2 marks)
  3. Write down a formula for \(y\) in terms of \(t\) when \(2 \leq t < 4\).
    (3 marks) \includegraphics[max width=\textwidth, alt={}, center]{88b98fe3-7952-44e4-8a8e-5f6f8813fbcc-2_634_771_1032_1192}
  4. Sketch a velocity-time graph for the motion of \(P\) during the twelve seconds.
  5. Find the maximum speed of \(P\) during the motion.
Edexcel M1 Q7
17 marks Standard +0.8
7. Two trains \(S\) and \(T\) are moving with constant speeds on straight tracks which intersect at the point \(O\). At 9.00 a.m. \(S\) has position vector \(( - 10 \mathbf { i } + 24 \mathbf { j } ) \mathrm { km }\) and \(T\) has position vector \(25 \mathbf { j }\) km relative to \(O\), where \(\mathbf { i }\) and \(\mathbf { j }\) are unit vectors in the directions due east and due north respectively. \(S\) is moving with speed \(52 \mathrm {~km} \mathrm {~h} ^ { - 1 }\) and \(T\) is moving with speed \(50 \mathrm {~km} \mathrm {~h} ^ { - 1 }\), both towards \(O\).
  1. Show that the velocity vector of \(S\) is \(( 20 \mathbf { i } - 48 \mathbf { j } ) \mathrm { km } \mathrm { h } ^ { - 1 }\) and find the velocity vector of \(T\).
  2. Find expressions for the position vectors of \(S\) and \(T\) at time \(t\) minutes after 9.00 a.m.
  3. Show that the bearing of \(T\) from \(S\) remains constant during the motion, and find this bearing.
  4. Show that if the trains continue at the given speeds they will collide.
Edexcel M1 Q1
5 marks Moderate -0.8
\begin{enumerate} \item Two particles, \(P\) and \(Q\), of mass 2 kg and 1.5 kg respectively are at rest on a smooth, horizontal surface. They are connected by a light, inelastic string which is initially slack. Particle \(P\) is projected away from \(Q\) with a speed of \(7 \mathrm {~ms} ^ { - 1 }\).
  1. Find the common speed of the particles after the string becomes taut.
  2. Calculate the impulse in the string when it jerks tight. \item Particle \(A\) has velocity \(( 8 \mathbf { i } - 3 \mathbf { j } ) \mathrm { m } \mathrm { s } ^ { - 1 }\) and particle \(B\) has velocity \(( 15 \mathbf { i } - 8 \mathbf { j } ) \mathrm { ms } ^ { - 1 }\) where \(\mathbf { i }\) and \(\mathbf { j }\) are perpendicular, horizontal unit vectors.
Edexcel M1 Q4
10 marks Standard +0.3
4. A cyclist and her bicycle have a combined mass of 78 kg . While riding on level ground and using her greatest driving force, she is able to accelerate uniformly from rest to \(10 \mathrm {~ms} ^ { - 1 }\) in 15 seconds against constant resistive forces that total 60 N .
  1. Show that her maximum driving force is 112 N . The cyclist begins to ascend a hill, inclined at an angle \(\alpha\) to the horizontal, riding with her maximum driving force and against the same resistive forces. In this case, she is able to maintain a steady speed.
  2. Find the angle \(\alpha\), giving your answer to the nearest degree.
  3. Comment on the assumption that the resistive force remains constant
    1. in the case when the cyclist is accelerating,
    2. in the case when she is maintaining a steady speed.
      (2 marks)
Edexcel M1 Q5
12 marks Moderate -0.3
5. \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{2108a1be-0214-42c4-9cb4-8622cc0fa496-3_318_832_1165_452} \captionsetup{labelformat=empty} \caption{Fig. 2}
\end{figure} Figure 2 shows a large block of mass 50 kg being pulled on rough horizontal ground by means of a rope attached to the block. The tension in the rope is 200 N and it makes an angle of \(40 ^ { \circ }\) with the horizontal. Under these conditions, the block is on the point of moving. Modelling the block as a particle,
  1. show that the coefficient of friction between the block and the ground is 0.424 correct to 3 significant figures.
    (6 marks)
    The angle with the horizontal at which the rope is being pulled is reduced to \(30 ^ { \circ }\). Ignoring air resistance and assuming that the tension in the rope and the coefficient of friction remain unchanged,
  2. find the acceleration of the block.
    (6 marks) Turn over
Edexcel M1 Q6
14 marks Moderate -0.3
6. Anila is practising catching tennis balls. She uses a mobile computer-controlled machine which fires tennis balls vertically upwards from a height of 2.5 metres above the ground. Once it has fired a ball, the machine is programmed to move position rapidly to allow Anila time to get into a suitable position to catch the ball. The machine fires a ball at \(24 \mathrm {~ms} ^ { - 1 }\) vertically upwards and Anila catches the ball just before it touches the ground.
  1. Draw a speed-time graph for the motion of the ball from the time it is fired by the machine to the instant before Anila catches it.
  2. Find, to the nearest centimetre, the maximum height which the ball reaches above the ground.
  3. Calculate the speed at which the ball is travelling when Anila catches it.
  4. Calculate the length of time that the ball is in the air.
Edexcel M1 Q7
18 marks Challenging +1.2
7. \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{2108a1be-0214-42c4-9cb4-8622cc0fa496-5_531_1061_283_468} \captionsetup{labelformat=empty} \caption{Fig. 3}
\end{figure} Figure 3 shows a particle \(X\) of mass 3 kg on a smooth plane inclined at an angle \(30 ^ { \circ }\) to the horizontal, and a particle \(Y\) of mass 2 kg on a smooth plane inclined at an angle \(60 ^ { \circ }\) to the horizontal. The two particles are connected by a light, inextensible string of length 2.5 metres passing over a smooth pulley at \(C\) which is the highest point of the two planes. Initially, \(Y\) is at a point just below \(C\) touching the pulley with the string taut. When the particles are released from rest they travel along the lines of greatest slope, \(A C\) in the case of \(X\) and \(B C\) in the case of \(Y\), of their respective planes. \(A\) and \(B\) are the points where the planes meet the horizontal ground and \(A B = 4\) metres.
  1. Show that the initial acceleration of the system is given by \(\frac { g } { 10 } ( 2 \sqrt { 3 } - 3 ) \mathrm { ms } ^ { - 2 }\).
  2. By finding the tension in the string, or otherwise, find the magnitude of the force exerted on the pulley and the angle that this force makes with the vertical.
  3. Find, correct to 2 decimal places, the speed with which \(Y\) hits the ground.
Edexcel M1 Q1
7 marks Moderate -0.3
  1. A constant force, \(\mathbf { F }\), acts on a particle, \(P\), of mass 5 kg causing its velocity to change from \(\left( { } ^ { - } 2 \mathbf { i } + \mathbf { j } \right) \mathrm { ms } ^ { - 1 }\) to \(( 4 \mathbf { i } - 7 \mathbf { j } ) \mathrm { ms } ^ { - 1 }\) in 2 seconds.
    1. Find, in the form \(a \mathbf { i } + b \mathbf { j }\), the acceleration of \(P\).
    2. Show that the magnitude of \(\mathbf { F }\) is 25 N and find, to the nearest degree, the acute angle between the line of action of \(\mathbf { F }\) and the vector \(\mathbf { j }\).
      (5 marks)
    3. A particle \(A\) of mass \(3 m\) is moving along a straight line with constant speed \(u \mathrm {~ms} ^ { - 1 }\). It collides with a particle \(B\) of mass \(2 m\) moving at the same speed but in the opposite direction. As a result of the collision, \(A\) is brought to rest.
    4. Show that, after the collision, \(B\) has changed its direction of motion and that its speed has been halved.
    Given that the magnitude of the impulse exerted by \(A\) on \(B\) is \(9 m \mathrm { Ns }\),
  2. find the value of \(u\).
Edexcel M1 Q3
9 marks Moderate -0.3
3. \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{e83297d6-d90c-42be-b67a-38ba2a495cb7-2_288_798_1318_525} \captionsetup{labelformat=empty} \caption{Fig. 1}
\end{figure} Figure 1 shows two window cleaners, Alan and Baber, of mass 60 kg and 100 kg respectively standing on a platform \(P Q\) of length 3 metres and mass 20 kg . The platform is suspended by two vertical cables attached to the ends \(P\) and \(Q\). Alan is standing at the point \(A , 1.25\) metres from \(P\), Baber is standing at the point \(B\) and the tension in the cable at \(P\) is twice the tension in the cable at \(Q\). Modelling the platform as a uniform rod and Alan and Baber as particles,
  1. find the tension in the cable at \(P\),
  2. find the distance \(B P\).
  3. State how you have used the modelling assumptions that
    1. the platform is uniform,
    2. the platform is a rod.
      (2 marks)
Edexcel M1 Q4
9 marks Standard +0.3
4. A sports car is being driven along a straight test track. It passes the point \(O\) at time \(t = 0\) at which time it begins to decelerate uniformly. The car passes the points \(L\) and \(M\) at times \(t = 1\) and \(t = 4\) respectively. Given that \(O L\) is 54 m and \(L M\) is 90 m ,
  1. find the rate of deceleration of the car. The car subsequently comes to rest at \(N\).
  2. Find the distance \(M N\).
    (4 marks)
Edexcel M1 Q5
11 marks Moderate -0.3
5. \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{e83297d6-d90c-42be-b67a-38ba2a495cb7-3_360_620_822_502} \captionsetup{labelformat=empty} \caption{Fig. 2}
\end{figure} A particle \(P\), of mass 2 kg , lies on a rough plane inclined at an angle of \(30 ^ { \circ }\) to the horizontal. A force \(H\), whose line of action is parallel to the line of greatest slope of the plane, is applied to the particle as shown in Figure 2. The coefficient of friction between the particle and the plane is \(\frac { 1 } { \sqrt { 3 } }\). Given that the particle is on the point of moving up the plane,
  1. draw a diagram showing all the forces acting on the particle,
  2. show that the ratio of the magnitude of the frictional force to the magnitude of \(H\) is equal to \(1 : 2\) The force \(H\) is now removed but \(P\) remains at rest.
  3. Use the principle of friction to explain how this is possible.
Edexcel M1 Q6
15 marks Standard +0.3
6. A car of mass 1.25 tonnes tows a caravan of mass 0.75 tonnes along a straight, level road. The total resistance to motion experienced by the car and the caravan is 1200 N . The car and caravan accelerate uniformly from rest to \(25 \mathrm {~m} \mathrm {~s} ^ { - 1 }\) in 20 seconds.
  1. Calculate the driving force produced by the car's engine. Given that the resistance to motion experienced by the car and by the caravan are in the same ratio as their masses,
  2. find these resistances and the tension in the towbar. When the car and caravan are travelling at a steady speed of \(25 \mathrm {~ms} ^ { - 1 }\), the towbar snaps. Assuming that the caravan experiences the same resistive force as before,
  3. calculate the distance travelled by the caravan before it comes to rest,
  4. give a reason why your answer to (c) may be unrealistic.
Edexcel M1 Q7
17 marks Standard +0.3
7. Two ramblers, Alison and Bill, are out walking. At midday, Alison is at the fixed origin \(O\), and Bill is at the point with position vector \(\left( { } ^ { - } 5 \mathbf { i } + 12 \mathbf { j } \right) \mathrm { km }\) relative to \(O\), where \(\mathbf { i }\) and \(\mathbf { j }\) are perpendicular, horizontal unit vectors. They are both walking with constant velocity - Alison at \(( 2 \mathbf { i } + 5 \mathbf { j } ) \mathrm { km } \mathrm { h } ^ { - 1 }\), and Bill at a speed of \(2 \sqrt { } 10 \mathrm {~km} \mathrm {~h} ^ { - 1 }\) in a direction parallel to the vector ( \(3 \mathbf { i } + \mathbf { j }\) ).
  1. Find the distance between the two ramblers at midday.
  2. Show that the velocity of Bill is \(( 6 \mathbf { i } + 2 \mathbf { j } ) \mathrm { km } \mathrm { h } ^ { - 1 }\).
  3. Show that, at time \(t\) hours after midday, the position vector of Bill relative to Alison is $$[ ( 4 t - 5 ) \mathbf { i } + ( 12 - 3 t ) \mathbf { j } ] \mathrm { km } .$$
  4. Show that the distance, \(d \mathrm {~km}\), between the two ramblers is given by $$d ^ { 2 } = 25 t ^ { 2 } - 112 t + 169$$
  5. Using your answer to part (d), find the length of time to the nearest minute for which the distance between the Alison and Bill is less than 11 km .
Edexcel M1 Q1
8 marks Moderate -0.8
1. \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{8a0ff401-83da-4539-a9e9-68736c57df2a-2_520_1278_207_333} \captionsetup{labelformat=empty} \caption{Fig. 1}
\end{figure} Figure 1 shows a distance-time graph for a car journey from Birmingham to Newquay which included a stop for lunch at a service station near Exeter. During the first part of the journey three-quarters of the total distance, \(d\), was covered in 3 hours. After a 1 hour stop, the remaining distance was completed in 2 hours.
  1. Calculate, in the form \(k : 1\), the ratio of the average speed during the first 3 hours of the journey to the average speed during the last 2 hours of the journey.
    (4 marks)
    Given that the average speed of the car over the whole journey (excluding the stop) was \(80 \mathrm { kmh } ^ { - 1 }\),
  2. find the average speed of the car on the first part of the journey.
    (4 marks)
Edexcel M1 Q2
8 marks Moderate -0.3
2. \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{8a0ff401-83da-4539-a9e9-68736c57df2a-2_291_613_1599_516} \captionsetup{labelformat=empty} \caption{Fig. 2}
\end{figure} Figure 2 shows a washing line suspended at either end by vertical rigid poles. A jacket of mass 0.7 kg is suspended in equilibrium part of the way along the line. The sections of the washing line on either side of the jacket make angles of \(35 ^ { \circ }\) and \(40 ^ { \circ }\) with the horizontal.
  1. Find the tension in the washing line on each side of the jacket.
  2. Explain why, in practice, the angles are likely to be very similar in value.
Edexcel M1 Q3
9 marks Moderate -0.3
3. In a simple model for the motion of a car, its velocity, \(\mathbf { v }\), at time \(t\) seconds, is given by $$\mathbf { v } = \left( 3 t ^ { 2 } - 2 t + 8 \right) \mathbf { i } + ( 5 t + 6 ) \mathbf { j } \mathrm { ms } ^ { - 1 }$$
  1. Calculate the speed of the car when \(t = 0\).
  2. Find the values of \(t\) for which the velocity of the car is parallel to the vector \(( \mathbf { i } + \mathbf { j } )\).
  3. Why would this model not be appropriate for large values of \(t\) ?