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A 120-kg roller coaster car is moving from a height of 40.0 meters. At the top of the second hill, it is moving with a

A 120-kg roller coaster car is moving from a height of 40.0 meters. At the top of the second hill, it is moving with a speed of 28 m/s and is elevated to a height of 10.0 meters. At what speed was the car moving at the top of the first hill?

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