A hockey ball of mass 200 g travelling at 10 m/s is struck by a hockey stick so as to return it along its original path with a velocity at 5 m/s. Calculate the magnitude of change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

Question

Accepted Answer

Answer :

Given, mass of the ball (m) = 200 g

Initial velocity of the ball (u) = 10 m/s

Final velocity of the ball (v) = 5 m/s

Initial momentum of the ball = mu = 200 × 10 = 2000 gm/s

Final momentum of the ball = m v = 200 × 5 = 1000 gm/s

Therefore, the change in momentum (m v – m u) = 1000 – 2000 = -1000 gm/s

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