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A uniform chain of length L and mass M is lying on a smooth table and one third of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, the work required to pull the hanging part on to the table is 

(a)  MgL                                    (b)  MgL/3

(c)   MgL/9                                (d)  MgL/18

Answer: D

(6)

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