$A$ 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 the acceleration due to gravity, the work required to pull the hanging part onto the table is
- A$MgL$
- B$MgL/3$
- C$MgL/9$
- D$MgL/18$
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