A uniform chain of length $2 \mathrm{~m}$ is kept on a table such that a length of $60 \mathrm{~cm}$ hangs…
A uniform chain of length $2 \mathrm{~m}$ is kept on a table such that a length of $60 \mathrm{~cm}$ hangs freely from the edge of the table. The total mass of the chain is $4 \mathrm{~kg}$. What is the work done in pulling the entire chain on the table?
$7.2 \mathrm{~J}$
$3.6 \mathrm{~J}$
$120 \mathrm{~J}$
$1200 \mathrm{~J}$
Solution
Work done $=\mathrm{mgh}=1.2 \times 0.3 \times 10=3.6 \mathrm{~J}$