a tennis ball has a mass of 0.6 kg. A professional tennis player hits the ball h
ID: 3895417 • Letter: A
Question
a tennis ball has a mass of 0.6 kg. A professional tennis player hits the ball hard enough to give it a speed of 45 m/s. The ball hits a wall and bounces back with a speed of 42 m/s. As indicated in the diagram, high speed photography shows that the ball is crushed 1.5cm at the instant when the speed is momentarily zero, before rebounding.
a. determine the approximate force that the wall exerts on the ball.
b. determine how long the ball is in contact with the wall.
c. clculate the loss in kinetic energy for the ball during the collision.
{explain and give answer plz***}
Explanation / Answer
a) acc = a
0 - 45^2 = 2*a*.015
a = - 6750
force + .6*6750 = 4050
b)impulse = change in momentum = .6*3 = 1.8
1.8 = 4050*t
t = .44 ms
c) loss in kinetic energy = 0.6(45^2 - 42^2)/2 = 78.3
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