Potential energy change calculation

A question is this type if and only if you must explicitly calculate the change in gravitational potential energy of a vehicle or object (ΔPE = mgh) over a given time or distance on an incline, as a distinct sub-part of a problem.

1 questions · Standard +0.3

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CAIE M1 2021 November Q5
11 marks Standard +0.3
5 A car of mass 1600 kg travels at constant speed \(20 \mathrm {~m} \mathrm {~s} ^ { - 1 }\) up a straight road inclined at an angle of \(\sin ^ { - 1 } 0.12\) to the horizontal.
  1. Find the change in potential energy of the car in 30 s .
  2. Given that the total work done by the engine of the car in this time is 1960 kJ , find the constant force resisting the motion.
  3. Calculate, in kW , the power developed by the engine of the car.
  4. Given that this power is suddenly decreased by \(15 \%\), find the instantaneous deceleration of the car.