1.

A particle of mass 2 kg travels according to equation S 3t +2t. Find the work done in 3 second of its119.motion.(1)6889 J(2) 6885 J(3) 1782 J(4) none of these

Answer»

s=3t³+2tdifferentiating s with respect to t to get velocityv=ds/dt=d(3t³+2t)/dt=9t²+2

in third second, v=9(3)²+2=83So, work done in 3 second of motion is,KE=(1/2)*m*v²KE=0.5*2*84*83KE=6889Jhence correct answer is (A)



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