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Q.

A body of mass 0.5 kg travels in a straight line with velocity u= a x3/2 where a= 5m-1/2s-1. The work done by the net force during its displacement from x = 0 to x = 2m is :

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a

50 J

b

100 J

c

1.5 J

d

10 J

answer is B.

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Detailed Solution

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here initial  velocity is zero and final velocity v=523/2

work done = change in kinetic energy

12mv2=120.552322=0.25×25×23=50 J

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