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If a number of forces act on a body and the body is in static or dynamic equilibrium, then:

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net work done by all the forces is -ve

net work done by all the forces is +ve

net work done by all the forces is zero

work done by any individual force must be zero

answer is D.

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Detailed Solution

When a number of forces act on a body and the body is in static or dynamic equilibrium (It means $F_{n e t}$ = 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.]

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