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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

`mg d//4`

B

`2 Mg d//4`

C

`-3 Mg d//4`

D

Mg d

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The correct Answer is:
C
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