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A hockey ball of mass 400 \(g\) travelling at 12 ms−1 is struck by a hockey stick so as to return it along its original path with a velocity at 4 ms−1. Calculate the magnitude of change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.
 
 \(g\)ms−1
 
Important!
Note: Enter your answer with 2 decimal digits.