A tennis player is practicing his volleys by bouncing balls off of a single gara

Question

A tennis player is practicing his volleys by bouncing balls off of a single garage door. The player bounces a single ball of mass 0.10 kg off of the garage door every 3.2 s. Each ball hits the door with a velocity of 4.4 m/s perpendicular to the surface of the door, and rebounds with a velocity of 3.4 m/s also perpendicular to the surface of the door.
(a) What is the impulse a single ball exerts on the garage door in a single bounce?
Answer: _____ N·s
(b) What is the average force exerted on the door by all of the bouncing balls?
Answer: ______ N

Explanation / Answer

mass m = 0.1 kg time t= 3.2 s initial velocity u = 4.4 m / s final velocity v = -3.4 m / s (a). impulse J = m( v - u) = -0.78 N s (b). force F = J / t = 0.24375 N

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