Mass
of the hockey ball, m
= 200 g = 0.2 kg
Hockey
ball travels with velocity, v1
= 10 m/s
Initial
momentum = mv1
Hockey
ball travels in the opposite direction with velocity, v2
= −5 m/s
Final
momentum = mv2
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.
Hope i helped
