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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`

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