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Gravity

A chain of le...

Question

A chain of length L is released from rest, from a frictionless surface with half length hanging as shown in figure. Work done by gravity when the chain is just completely off the surface.
(m=10 kg, g=10 $m / s^{2}$ and L=10 $m$ )

A

475 J

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B

375 J

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C

250 J

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D

75 J

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Solution

The correct option is B 375 J
Work done by gravity = change in potential energy
$= \frac{m g l}{2} - \frac{m g l}{4}$ $= \frac{3 m g l}{8} = 375$ J

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