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A roller coaster with a mass of 3500 Kg goes over its first hill with a speed of 15m/s. the first hill has a vertical

A roller coaster with a mass of 3500 Kg goes over its first hill with a speed of 15m/s. the first hill has a vertical drop of 60 M. how fast is the roller coaster going at the bottom of the first hill? ignore friction and air resistance.

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