# A uniform chain of length L and mass M is lying on a smooth table. One-fourth of its length is hanging vertically down over the edge of the table. How much work need to be done to pull the hanging part back to the table ?

Q: A uniform chain of length L and mass M is lying on a smooth table. One-fourth of its length is hanging vertically down over the edge of the table. How much work need to be done to pull the hanging part back to the table ?

(a) MgL

(b) MgL/2

(c) MgL/8

(d) MgL/32

$\large W = \frac{M}{4}g \frac{L}{8}$
$\large W = \frac{M g L}{32}$