Physics · Oct / Nov 2022 · Paper 21 · Question 7

Fig. 7.1 shows a child sitting on a sledge on a snow-covered hill of constant slope. sledge brake child snow-covered hill wall Fig. 7.1 (not to scale) At time t = 0, the child and the sledge begin to move down the hill in a straight line. When the child sees a wall ahead, he applies the brake. The child and sledge continue to travel in a straight line until they come to a stop before hitting the wall. 13 Fig. 7.2 is the speed-time graph for the journey. 0 0 4 8 12 16 4 8 12 16 t / s 20 24 28 32 speed m / s Fig. 7.2 The brake is applied at t = 26 s.

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