A6 kg tennis ball moves at a velocity of 14 m/s. the ball is struck by a racket, causing it to rebound in the opposite direction at a speed of 5 m/s. what is the change in the ball’s momentum? report the number of kg‧m/s with the appropriate sign.

What would occur if the index of refraction of a material was less than n=1? the speed of light would increase to a speed larger than the maximum speed of light in a vacuum. the light wave would not bend at all though the material. the light wave would not be able to refract and would instead reflect off of the material. the speed of light would reduce to values close to 0 m/s.