A) \[Mg\frac{d}{4}\]
B) \[3Mg\frac{d}{4}\]
C) \[-3Mg\frac{d}{4}\]
D) \[Mgd\]
Correct Answer: C
Solution :
[c] As the cord is trying to hold the motion of the block, work done by the cord is negative. \[\operatorname{W}=-M\left( g-a \right)d\] \[=-M\left( g-\frac{g}{4} \right)d=\frac{-3\,M\,g\,d}{4}\]
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