Physics (AS & A Level) · May / June 2018 · Paper 22 · Question 3

A child on a sledge slides down a steep hill and then travels in a straight line up an ice-covered slope, as illustrated in Fig. 3.1. A B ice-covered slope child and sledge total mass 70 kg 18 m s–1 Fig. 3.1 (not to scale) The sledge passes point A with speed 18 m s–1 at time t = 0 and then comes to rest at point B. The child applies a brake to the sledge at point B. The brake does not keep the sledge stationary and it immediately slides back down the slope towards A. The variation with time t of the velocity v of the sledge from t = 0 to t = 24 s is shown in Fig. 3.2. 24 20 16 12 8 4 0 10 0 –10 20 v / m s–1 t / s Fig. 3.2

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