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Question:

A hockey ball of mass200g travelling at10ms−1;is struck by a hockey stick so as to return it along its original path with a velocity at5ms−1;. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.A hockey ball of mass200g travelling at10ms−1;is struck by a hockey stick so as to return it along its original path with a velocity at5ms−1;. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.2002002002002001010101010s−1;s−1;s−1;s−1;sss−1;−1;−1;−−1;155555s−1;s−1;s−1;s−1;sss−1;−1;−1;−−1;1?

Solution:

Initial velocity of the ball,u=−1;0 ms−1;(- sign shows the opposite direction)Final velocity of the ball,v=5ms−1;Mass of the ball,m=200 g=0.2 kgNet change in the momentum of the ball,ΔP=Pf−PiΔP=mv−mu=m×5−m×(−1;0)∴ΔP=15×m=15×0.2=3 kg m s−1;