The net work done by the tension in the figure, when the bigger block of mass M touches the ground is

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zero

$- (M + m) gd$

$- mgd$

$+ Mgd$

answer is D.

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Detailed Solution

The magnitude of work done on each mass will be same as the tension force is same and the magnitude of displacement is same for each block.

Work done by tension on M is negative (force and displacement are in opposite directions). But work done by tension on m is positive. Net work done will be zero.

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