A box of mass 2 kg is pulled through 1m along a level floor by force is 8 N. The box is raised vertically on a bench 2 m high work done on the box is

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28 J

48 J

20 J

40 J

answer is B.

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Detailed Solution

Given mass of box m = 2 kg Length l=1 m Force F=8 N Height h=2 m W.D=F.S+mgh =8×1+×2×10×2 =8+40=48 J

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