A racquet ball with mass m = 0.229 kg is moving toward the wall at v = 16.8 m/s

Question

A racquet ball with mass m = 0.229 kg is moving toward the wall at v = 16.8 m/s and at an angle of ? = 32

A racquet ball with mass m = 0.229 kg is moving toward the wall at v = 16.8 m/s and at an angle of ? = 32degree with respect to the horizontal. The ball makes a perfectly elastic collision with the solid, frictionless wall and rebounds at the same angle with respect to the horizontal. The ball is in contact with the wall for t = 0.064 s. 1) What is the magnitude of the initial momentum of the racquet ball? kg-m/s 2) What is the magnitude of the change in momentum of the racquet ball? kg-m/s 3) What is the magnitude of the average force the wall exerts on the racquet ball? N 4) Now the racquet ball is moving straight toward the wall at a velocity of vi = 16.8 m/s. The ball makes an inelastic collision with the solid wall and leaves the wall in the opposite direction at vf = -10.4 m/s. The ball exerts the same average force on the ball as before. What is the magnitude of the change in momentum of the racquet ball? kg-m/s 5) What is the time the ball is in contact with the wall? s 6) What is the change in kinetic energy of the racquet ball? J

Explanation / Answer

1) initial momentum=mvi

2) change in momentun=mvf-mvi

3) F=change in momentum/time

4) change in momentum=mvf-mvi

5) t=chnage in momentum/Force

6) change in KE= m(vf2-vi2)/2

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