| Exam Board | CAIE |
|---|---|
| Module | M1 (Mechanics 1) |
| Year | 2015 |
| Session | November |
| Marks | 4 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Work done and energy |
| Type | Lifting objects vertically |
| Difficulty | Easy -1.2 This is a straightforward application of basic work-energy formulas (W = mgh, P = W/t) with direct substitution of given values. Requires only recall of standard definitions with no problem-solving insight or multi-step reasoning, making it easier than average but not trivial since students must identify the correct formulas and handle units properly. |
| Spec | 6.02a Work done: concept and definition6.02k Power: rate of doing work |
| Answer | Marks | Guidance |
|---|---|---|
| Answer/Working | Mark | Guidance |
| \(200g \times 0.7\) | M1 | For using \(WD = mg \times h\) |
| Work done \(= 1400\) J | A1 (2) |
| Answer | Marks | Guidance |
|---|---|---|
| Answer/Working | Mark | Guidance |
| \(1400/1.2\) | M1 | For using Power \(= WD/\text{Time}\) |
| Average Power \(= 1170\) W | A1\(\checkmark\) (2) |
## Question 1:
### Part (i):
| Answer/Working | Mark | Guidance |
|---|---|---|
| $200g \times 0.7$ | M1 | For using $WD = mg \times h$ |
| Work done $= 1400$ J | A1 (2) | |
### Part (ii):
| Answer/Working | Mark | Guidance |
|---|---|---|
| $1400/1.2$ | M1 | For using Power $= WD/\text{Time}$ |
| Average Power $= 1170$ W | A1$\checkmark$ (2) | |
---1 A weightlifter performs an exercise in which he raises a mass of 200 kg from rest vertically through a distance of 0.7 m and holds it at that height.\\
(i) Find the work done by the weightlifter.\\
(ii) Given that the time taken to raise the mass is 1.2 s , find the average power developed by the weightlifter.
\hfill \mbox{\textit{CAIE M1 2015 Q1 [4]}}