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Q.
If a number of forces act on a body and the body is in static or dynamic equilibrium, then:
Work, Energy and Power
Solution:
When a number of forces act on a body and the body is in static or dynamic equilibrium (It means $F_{\text{net}} = 0$), then individual force may do the work, but net work done by all the forces will be zero.
[Note: In such a situation, work done by some forces is positive while by others is equally negative, so that net work becomes zero.]