A uniform chain of length $2\; m$ is kept on a table such that a length of $60\; cm$ hangs freely from the edge of the table. The total mass of the chain is $4\; kg$. What is the work done in pulling the entire chain on the table?

Question

( A ) 120 J
( B ) 1200 J
( C ) 7.2 J
( D ) 3.6 J