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19. A sled and rider with a combined weight of 60 kg are at rest on the top of a hill 12 m high. (a)

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19. A sled and rider with a combined weight of 60 kg are at rest on the top of a hill 12 m high. (a) What is their total energy at the top of the hill? (b) Assuming there is no friction, what would the total energy be on sliding halfway down the hill? (c) How about at the bottom of the hill

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