A uniform chain of length 2,m is kept on a table such that a length of 60,,cm hangs freely from edge

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5.Work, Energy, Power and Collision

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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 .............. $\mathrm{J}$

A

$7.2$

B

$3.6$

C

$120$

D

$1200$

Solution

$\mathrm{W}=\frac{\mathrm{mg} \ell}{2 \mathrm{n}^{2}}$ where $\mathrm{n}=\frac{200}{60}=\frac{10}{3}$

$\mathrm{W}=\frac{4 \times 10 \times 2 \times 9}{2 \times 10 \times 10}=3.6 \mathrm{J}$

Standard 11

Physics

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