A cord is used to lower vertically a block of mass $M$ by a distance $d$ with constant downward acceleration $\frac{g}{4}$. Work done by the cord on the block is
A cord is used to lower vertically a block of mass $M$ by a distance $d$ with constant downward acceleration $\frac{g}{4}$. Work done by the cord on the block is
- A
$mg\frac{d}{4}$
- B
$3mg\frac{d}{4}$
- C
$-3mg\frac{d}{4}$
- D
$Mgd$
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