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Q.

A body of mass 3 kg is under a constant force which causes a displacement s in meters in it, given by the relation s=13t2, where t is in seconds. Work done (in joules) by the force in 2 seconds is

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a

519

b

83

c

38

d

195

answer is B.

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Detailed Solution

V=dsdt=2t3,

V1=0&V2=43

W=12m(V22−V12)=12(3)(169−0)=83J

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