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A chain of length l and mass m lies in a...

A chain of length `l` and mass `m` lies in a pile on the floor. If its end A is raised vertically at a constant speed `v_0`, express in terms of the length y of chain which is off the floor at any given instant.
(a) The magnitude of the force P applied to end A.
(b) Energy lost during the lifting of the chain.

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