A box is pushed through 4.0 m across a floor offering 100 N resistance. How much work is done by the resisting force ?

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Solution

$F = 100 N, S = 4 m, θ = 0^{\circ}$

Work done against resisting force $W = \to F . \to S = 100 \times 4 = 400$ J
work done by resisting force =-400 J

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