(Answered) A man pulls a 15-kg sled 66 meters along an angled hill

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A man pulls a 15-kg sled 66 meters along an angled hill with a force of 83 N, which elevates the man 30 meters above the bottom of the hill. The man then hops on his sled and slides from rest to the bottom of the hill back along his 66 meter path, during which a 160 N frictional force acts upon his sled. How much work in Joules does the man do pulling the sled up the hill?

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