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Q.

A body of mass 3 kg is under a force which causes a displacement in it, given by s =t2 / 3 (in m). Find the work done by the force in 2 second

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a

2j

b

3.8j

c

5 .2j

d

2.6 j

answer is D.

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Detailed Solution

W=∫02 F⋅ds=∫02 mads=∫02 m⋅d2sdt2⋅dsdt⋅dt=∫02 32323tdt=43∫02 tdt=43t2202=43×42=83=2⋅6J
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A body of mass 3 kg is under a force which causes a displacement in it, given by s =t2 / 3 (in m). Find the work done by the force in 2 second