Question

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

Answer 1

W=1/2×m×(v^2-u^2)
W=1/2×20×(2500-1600)
W=10×900
W=9000J

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