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A 20 meter chain hangs off the side of a 100 meter tall building. If the mass density of the chain is 3 kg/m, then

A 20 meter chain hangs off the side of a 100 meter tall building. If the mass density of the chain is 3 kg/m, then how much work is required to lift half the chain to the top of the building? Express your answer in terms of g

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