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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

`3Mg ""(d)/4`

C

`-3Mg ""(d)/4`

D

Mgd

Text Solution

Verified by Experts

The correct Answer is:
C
`T =M (g-g/4)=(3Mg)/4`
`W = Td cos theta = (3Mg)/(4) d cos 180^@ = (-3Mgd)/(4)`
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