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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.
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.


Mass (m)=200 grams=0.2 kg, velocity (v1)=10 m/s
The momentum the hockey ball was having when it was going towards the stick 
initial momentum(p1)=m×v1
p1=2 kg m/sec
Now, the final momentum  (p2) of the ball after being striked by the stick will be :
where v2=5 m/sec
p2=1 kg m/sec
Now the change in momentum will be p2-p1=2-1=1kg m/sec                 Ans.
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