12. A tennis ball of mass 0.4 Kg rebounds from a tennis racquet. The balls speed
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12. A tennis ball of mass 0.4 Kg rebounds from a tennis racquet. The balls speed approaching the racquet is 25 m/s and its speed leaving the racquet (in the opposite direction from its approaching speed) is 35 m/s. The force experienced by the ball during it's time in contact with the tennis racquet was 1000 N. a) What was the force experienced by the tennis racquet during it's time in contact with the ball? b) What was the momentum of the tennis ball before it hit the racquet? c) What was the change in momentum of the tennis ball after it was hit by the racquet (as compared with its momentum before it was hit)? d) How long was the ball and tennis racquet in contact with each other? e) You learned in class that momentum is conserved during collisions. How do you explain your answer to part (c) in relation to this?Explanation / Answer
a] force experienced by racket is 1000 N, by newtons third law of motion.
b] momentum = mv = 0.4*25 = 10 kg m/s
c] change in momentum = 0.4*(-35 -25 ) = -24 kg m/s
d] t = impulse/F = -24/-1000 = 0.024 s
e] In this case an external force is acting which is applied by tennis player. Momentum is conserved if there is no external force in that direction.
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