Fewpal
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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.

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Mass of the hockey ball, m= 200 g = 0.2 kg 

Hockey ball travels with velocity, v1= 10 m/s 

Initial momentum = mv

Hockey ball travels in the opposite direction with velocity, v2= -5 m/s 

Final momentum = mv

Change in momentum = mv1- mv2= 0.2 [10 - (-5)] = 0.2 (15) = 3 kg m s-1 

Hence, the change in momentum of the hockey ball is 3 kg m s-1

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