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5. A point mass of 0.5 kg is moving along x-axi asx +2t, where, x is in meters an t is in seconds.Find the work done (in J) by all the forces acting on the body during the time interval[ 0,2s)- Ay Tvo forces F and F are

Answer»

given X = t²+2t

so, x' = v = 2t+2

and hence acceleration = x" = 2 m/s²

so, force will be m*a = 0.5*2 = 1N

now displacement at (t=2sec) is = (2)²+(2*2) = 8m

so, w = F.ds = 1*8 = 8J



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