Q.

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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a

+ Mgd

b

- (M + m)gd

c

- mgd

d

zero

answer is D.

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Detailed Solution

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