How much work must be done to lift the entire cable to the, Mathematics

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How much work must be done to lift the entire cable to the

A 20 m long cable weighs 40 kg. It is hanging off the top of a pole that is 30 m high.

(a) How much work must be done to lift the entire cable to the top of the pole?

(b) How much work must be done to lift half the cable to the top of the pole (so that 10 m still hangs over the edge)?

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