A hockey ball of mass 200 g travelling at 10 m s-1 is struck by a hockey stick so as to return it along its original path with a velocity at 5 m s-1. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

Mass of the hockey ball, m = 200 g = 0.2 kg
Hockey ball travels with velocity, v1 = 10 m/s
Initial momentum = mv1
Hockey ball travels in the opposite direction with velocity, v2 = ˆ’5 m/s
Final momentum = mv2
Change in momentum = mv1 ˆ’ mv2 = 0.2 [10 ˆ’ (ˆ’5)] = 0.2 (15) = 3 kg m sˆ’1
Hence, the change in momentum of the hockey ball is 3 kg m sˆ’1.

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