Question

A 0.20-kg billiard ball travelling at a speed of 15 m/s?
strikes the side rail of a pool table at an angle of 60°. If the ball rebounds at the same speed and angle, what is the magnitude of its change in momentum?

I need help!
bobpursley
only the perpendicular velocity changes.
how is the angle measured, to the side, or to the normal? I will assume to the side.
change velocity perpendicular to rail=2*15cos60

momentum change=.2*changevelocity

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