Question

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

• A. $12J$
• B. $3.6J$
• C. $7.2J$
• D. $1200J$

Answer 1

The correct option is B $3.6J$

Mass of 2 m chain is 4 kg

Mass of 0.6 m chain is 1.2 kg

Work done in pulling the 0.6m chain on to the table is $1.2\times 10\times \frac{0.6}{2}=3.6J$