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JEE Advanced 2020 Full Test 2 Paper 1

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Question : 7

Total: 54

A chain of length L and mass per unit length ρ is piled on a horizontal surface. One end of the chain is lifted vertically with constant velocity by a force P.

P as a function of height x of the end above the surface will be ρ(gx+v2).
No energy will loss in this process.
Work done by force will be ‌
1
2
ρgL2+ρV2L
Loss in energy ‌
1
2
ρgLv2

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