# A hockey ball of mass 200g travelling at 10m/s is struck by a hockey stick so as to return it along its original path with a velocity at 5m/s.Calculate the change of linear momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

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where is the time taken given in the question

time isnt mentioned in the question

Birendrak , Time is not required to solve this question! it can be solved like this only.

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