1.

A force is applied on a body of mass 20kg moving with a velocity of 40ms-1 . The body attains a velocity of 50ms-1 in 2 seconds. Calculate the work done by the body.

Answer»

Work done, W = 1/2m(v22 - v12)

= 1/20x 20(502 - 402) = 9000J



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