Question
Wed August 15, 2012 By:

when impulse is asked when should we use (mv-mu)and when should we use (mu-mv)please give me the answer

Expert Reply
Fri August 17, 2012
This answer depends on the frame of reference in consideration.
Eg. suppose we are required to find the impulse tranferred on a bat by a ball, so there we will use:
mv-mu
where as the impuse on  the ball by bat wil be mu-mv
as in this case the force is transmitted to the bat by ball in the direction of initial velocity of ball.
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