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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