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OpenStudy (anonymous):
A 500 kg roller coaster car is pulled to the top of a hill 45 m high and arrives at the top with zero speed. a. How much work is done by the chain that pulls the car to the top? b. How fast will the car be going when it gets back to ground level, 45 m below? c. How fast will the car go at a point 29 m above ground?
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