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1. Figure shows a roller coaster car at rest on the track at the top of a hill that is 15m high. Th e car

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1. Figure shows a roller coaster car at rest on the track at the top of a hill that is 15m high. Th e car has a mass of 10.0kg. It begins to move and reaches a speed of 10.0 m/s at the top of the second hill, point A, on the track. Calculate the height of hill A. [5A]

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