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A box is pushed through 4m across a floor offering 100 N resistance.How much work is done by resisting force? I expect the answer to be (-400 J) but it is 400 J. It is from H.C.V erma book. why is the answer +400 J?

A box is pushed through 4m across a floor offering 100 N resistance.How much work is done by resisting force? I expect the answer to be (-400 J) but it is 400 J. It is from H.C.V erma book. why is the answer +400 J?

Grade:

1 Answers

Sumit Majumdar IIT Delhi
askIITians Faculty 137 Points
7 years ago
Dear Student,
The answer shud be -400 N as here the direction of displacement is Opposite to that of the resisting force ie. Body moves forward and Force acts backwards.
And W=F.d=Fd
so the work done is negative.
Regards
Sumit

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