A cord is used to lower vertically a block of mass M by a di... — Physics | Mockzy | Mockzy

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A cord is used to lower vertically a block of mass M by 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

3Mgd/4

C

Mgd

D

−3Mgd/4

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