Question

What is a amount of work done by a weightlifter in holding a weight of 100 kg on his shoulder for 40 seconds?

Answer 1

Hey!

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Work done = Force × Displacement


Man is holding a weight of 100 kg for 40 seconds but isn't moving around anywhere, there is no displacement of either the weight or the man, thus displacement = 0

Work done = Force × 0
Work done = 0

Thus, no work is done by the weight lifter.

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Hope it helps...!!!

Answer 2

work done = f ×s

and according to question

there is no displacement and no force.

So,

Work done = f×s

=0×0

=0