1.

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 isA. `mg d//4`B. `3 Mg d//4`C. `-3 Mg`D. `mg d`

Answer» Correct Answer - C
`Mg - T = Ma = (Mg)/(4)`
`T = (3 Mg)/(4)`
`W = - T xx d = (-3 Mgd)/(4)`


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