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A. Mary's 40 kg brother is at rest on a swing 0.50 m off the ground. Initial and final situation + forces She pulls him

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A. Mary's 40 kg brother is at rest on a swing 0.50 m off the ground. Initial and final situation + forces She pulls him up until he is 2.0 m off the ground and releases him. How fast is her brother moving after he passes the bottom and has gone up to 1.5 m off the ground? KE; Ugi Usi Wother AEth KEf Ugf Us

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