A cord is used to lower vertically a block of mass \( M \) by a distance \( d \) with constant d...

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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
[AIIMS 2010]
(a) \( \operatorname{Mg} \frac{d}{4} \)
(b) \( 3 \operatorname{Mg} \frac{d}{4} \)
(c) \( -3 \operatorname{Mg} \frac{d}{4} \)
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