Question

A chain of mass $2Kg$ and length $2m$ is hanging on the edge of table such that half portion of the chain is on the table. The work required to pull the entire chain on the tabe is:

• A. $10J$
• B. $5J$
• C. $20J$
• D. $15J$

Answer 1

The correct option is B $5J$

mass of hanging chain=1kg

centre of mass is at a distance of $\frac{1}{2}$

W=$1\times 10\times \frac{1}{2}=5J$