Physics (AS & A Level) · May / June 2017 · Paper 13 · Question 17

A man has a mass of 80 kg. He ties himself to one end of a rope which passes over a single fixed pulley. He pulls on the other end of the rope to lift himself up at an average speed of 50 cm s$^{-1}$. What is the average useful power at which he is working?

1. A40 W
2. B0.39 kW
3. C4.0 kW
4. D39 kW

As printed in the paper