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)`

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

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

`mg d`

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