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

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

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

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

`Mgd`

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