# 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 of 5 m//

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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 of 5 m//s. Calculate the change in momentum of the hockey ball by the force applied by the hockey stick.

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Here, m =200g = (200)/(1000) kg = 1/5 kg
initial velocity, u=10 ms^(-1)
final velocity, v= -5 ms^(-1), negative sign is used because the ball returns along the origional path.
change of momentum = final momentum-initial momentum
mv-m u = 1/5(-5) - 1/5(10) = -3kg m//s`