A hockey ball of mass 200 g travelling at 10 ms-1 is struck by a hockey stick so as to return it along its original path with a velocity at 5 ms-1. Calculate the magnitude of change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick. Solution Given, mass of the ball (m) = 200g Initial velocity of the ball (u) = 10 m/s Final velocity of the ball (v) = - 5m/s Initial momentum of the ball = mu = 200g × 10 ms-1 = 2000 g.m.s-1 Final momentum of the ball = mv = 200g × -5 ms-1 = -1000 g.m.s-1 Therefore, the change in momentum (mv - mu) = -1000 g.m.s-1 - 2000 g.m.s-1 = -3000 g.m.s-1 This implies that the momentum of the ball reduces by 1000 g.m.s-1 after being struck by the hockey stick.
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