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Q.

A block of mass 'M' is lowered with the help of a rope of negligible mass through a distance 'd' with an acceleration ofg3 . Work done by the rope on the block is

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a

−2Mgd3

b

−Mgd3

c

2Mgd3

d

Mgd3

answer is B.

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Detailed Solution

W=F¯.S¯−Td(θ=180°)

here T=M(g−a)

W=−M(g−a)d

=−M(g−g3)d

=−2Mgd3

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