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Q.

A Cord is used to lower vertically a block of mass m a distance d at a constant downward acceleration of g4, then the work done by the Cord on the block is

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a

mgd4

b

mgd

c

−3mgd4

d

3mgd4

answer is C.

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Detailed Solution

The block is coming down with acceleration       

g4 thus Mg−F=Ma=Mg4;F=34Mg

the workdone by the card on the block is 
 w=Fdcosθ=34Mg×dcos1800

w=−34Mgd

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A Cord is used to lower vertically a block of mass m a distance d at a constant downward acceleration of g4, then the work done by the Cord on the block is