Physics (AS & A Level) · Oct / Nov 2018 · Paper 11 · Question 17

The force resisting the motion of a car is proportional to the square of the car's speed. The magnitude of the force at a speed of 20.0 m s⁻¹ is 800 N. What useful output power is required from the car's engine to maintain a steady speed of 40.0 m s⁻¹?

1. A32 kW
2. B64 kW
3. C128 kW
4. D512 kW

As printed in the paper