Physics (AS & A Level) · May / June 2021 · Paper 13 · Question 18

A car of mass 500 kg is at rest at point X on a slope, as shown. The car's brakes are released and the car rolls down the slope with its engine switched off. At point Y the car has moved through a vertical height of 30 m and has a speed of 11 m s⁻¹. What is the energy dissipated by frictional forces when the car moves from X to Y?

1. A3.0 × 10⁴ J
2. B1.2 × 10⁵ J
3. C1.5 × 10⁵ J
4. D1.8 × 10⁵ J

As printed in the paper