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A cord is used to lower vertically a blo...

A cord is used to lower vertically a block of mass `M`, a distance `d` at a constant downward acceleration of `(g)/(4)`, then the work done by the cord on the block is

A

`(Mgd)/(4)`

B

`-(Mgd)/(4)`

C

`(3Mgd)/(4)`

D

`-(3Mgd)/(4)`

Text Solution

Verified by Experts

The correct Answer is:
D

`Mg-T=Ma=(Mg)/(4)impliesT=(3Mg)/(4)`
Work done by the cord is
`-Td=-(3Mgd)/(4)`
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