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Q.

A body of mass M starts moving from rest along x-axis so that its velocity varies v=as Where a is constant and s is the distance covered by the body. The total work done by all the forces  acting on the body in the first second after the start of the motion is

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a

16Ma4t

b

18Ma4t2

c

4Ma4t2

d

12Ma4t2

answer is C.

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Detailed Solution

v=as dsdt=as dss=adt 2s=at s=a2t24 F=Mvdvds=Masa2s=Ma22 Work done=Ma22×a2t24=18Ma4t2

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