Question

A hockey ball of mass 300 g travelling at 20 ms^–1 is struck by a hockey stick so as to return it along its original path with a velocity at 5 ms^–1. Calculate the change of momentum that occurred in the motion of the hockey ball by the force applied by the hockey stick.

• A. 6.5 Ns
• B. 5 Ns
• C. -7.5 Ns
• D. 2 Ns

Answer 1

The correct option is C

-7.5 Ns

Change in momentum = 0.3(-5-20) Ns = -7.5Ns.