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Average and Instaneous Power

A chain of ma...

Question

A chain of mass $2 K g$ and length $2 m$ 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

10 J

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B

5 J

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C

20 J

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D

15 J

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Solution

The correct option is B $5 J$
mass of hanging chain=1kg
centre of mass is at a distance of $\frac{1}{2}$
W= $1 \times 10 \times \frac{1}{2} = 5 J$

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