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QUESTION 5 (Start on a new page.) A roller-coaster car of mass 200 kg, with the engine switched off, travels along track ABC which has a rough surface, as shown in the diagram below. At point A, which is 10 m above the ground, the speed of the car is 4 m.s. At point B, which is at a height h above the ground, the speed of the car is 2 m.st. During the motion from point A to point B, 3,40 x 10 J of energy is used to overcome friction. Ignore rotational effects due to the wheels of the car. 4 m.s 2 m.s1 22 m B h 10 m (2) 5.1 Define the term non-conservative force. botravelled from
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