Q.

A body of mass 2 kg is projected with an initial velocity of 5 ms-1 along a rough horizontal table. The work done on the body by the frictional forces before it is brought to rest is

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a

250 J

b

25 J

c

-250 J

d

-25 J

answer is D.

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Wf=12mvf2-12mvi2
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