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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 | 
                            
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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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