First slide

Work done by Diff type of forces

Question

A chain is held on a frictionless table with one-third of its length hanging over the edge. If the chain has a length L and mass M, how much work is required to pull the hanging part back on the table?

Moderate

A

MgL
B

MgL/3
C

MgL/9
D

MgL/18

Solution

$Workdone = \frac{MgL}{2 n^{2}} = \frac{MgL}{2 (3)^{2}} = \frac{MgL}{18}$

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