Question

a force changes the velocity of a body of a mass 10kg from 5m/s to 20m/s in 2s. find (a) the initial momentum of the body (b) the final momentum of the body (c) the change in momentum of the body (c) the force acting on the body?

Answer 1

A force changes the velocity of a body of a mass 10kg from 5m/s to 20m/s in 2s.

Mass, m = 10 kg
Initial velocity, u = 5 m/s
Final velocity, v = 20 m/s
Time, t = 2s

A)
Initial momentum = mu = 10×5 = 50 kg.m/s

B)
final momentum = mv = 10×20 = 200 kg.m/s

C) Change in momentum= final momentum - initial momentum = 200 - 50 = 150 kg.m/s

D) Force = change in momentum/ time = 150/2 = 75N

Answer 2

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