A force is applied on a body of mass 20 kg moving with a velocity of 40ms. The body attains a velocity of 50 ms in 2 seconds. Calculate the work done by the body.
Work = F x s = m x a x s
a = (v -u)/t = 5 ms-2
s = (v2 -u2)/2a = (2500 - 1600)/10 = 90 m
Work = m x a x s = 20 x 5 x 90 = 9000 kgm2s-2