# Question #5073f

##### 1 Answer

#### Explanation:

Lets take a general situation:

Let a chain of **mass M** and **length L** is held on a frictionless table in such a way that

The portion hanging from the table is

**Required work done #=#change in potential energy of chain**

Now,let Potential energy (U)

**Potential energy initial #rArr#mgh** { h is the length of the

hanging portion from centre of mass]

**For regularly shaped uniform bodies, P.E change can be calculated by considering their mass to be centered at the geometrical point.**

Mass of

Mass of

Therefore required work done