A uniform chain of length \( L \). and mass \( M \) is lying on a smooth table and one third of ....

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A uniform chain of length \( L \). and mass \( M \) is lying on
\( \mathrm{P} \)
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, work required to pull the hanging part on to the table is
(1) \( M g L \)
(2) \( \frac{M g L}{3} \)
(3) \( \frac{M g L}{9} \)
(4) \( \frac{M g L}{18} \)


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