A hockey ball of mass 200 g hits on a hockey stick with a velocity 10

1.	A hockey ball of mass 200 g hits on a hockey stick with a velocity 10 m/s. Calculate the change in momentum if the ball bounces back on the same path with the same speed.
Answer» m = 200g = 200/1000 = 0.2 kg Initial momentum = mu = 0.2 × 10 = 2 kg m/s Final momentum = mv = 0.2 × 70 = 2 kg m/s change in momentum = mv – mv = – 2 – 2 = -4 kg m/s

A hockey ball of mass 200 g hits on a hockey stick with a velocity 10 m/s. Calculate the change in momentum if the ball bounces back on the same path with the same speed.

Answer»

m = 200g = 200/1000 = 0.2 kg

Initial momentum = mu

= 0.2 × 10 = 2 kg m/s

Final momentum = mv

= 0.2 × 70 = 2 kg m/s

change in momentum = mv – mv = – 2 – 2 = -4 kg m/s