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A roller coaster car is at rest on the track at the top of a hill (point W) that is 15 m high. The car

A roller coaster car is at rest on the track at the top of a hill (point W) that is 15 m high. The car has a mass of 10.0 kg. It begins to move and reaches a speed of 15.0 m/s at the top of the second hill (point Y) on the track. Calculate the height of the second hill. (4 marks)

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