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A hockey ball of mass 200 g travelling at 10 ms–1. It struck by a hockey stick so as to return. It along it's original path with a velocity at 5 ms–1. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.
mass of ball m = 200 g
= 0.2 kg
initial velocity of ball u = 10 ms–1
final velocity of ball v = 5 ms–1
initial momentum of ball = mu
= 0.2 × 10
= 2 kgm/s
final momentum of ball = mv
= 0.2 × (–5)
= –1 kgm/s
Change in momentum = mv – mu
= –1 – 2
= –3 kg-m/s
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