-14 points MI4 2.2018 the left, hi ball is crushed about d = 2.1 cm at the insta

Question

-14 points MI4 2.2018 the left, hi ball is crushed about d = 2.1 cm at the instant when its speed is momentarily zero, before rebounding. has a mass of 0.0s7 kg. A professional tennis player hits the ball hard enough to give it a speed of 44 m/s (about 99 miles per hour.) The ball moves to ts a wall and bounces straight back to the right with almost the same speed (44 m/s). As indicated in the diagram below, high-speed photography shows t Making the very rough approximation that the large force that the wall exerts on the ball is approximately constant during contact, determine the approximate magnit this force. What is the average speed of the ball during the period from first contact with the wall to the moment the ball's speed is momentarily zero? m/s How time elapses between first contact with the wall, and coming to a stop? seconds what is the magnitude of the average force exerted by the wall on the ball during contact? In contrast, what is the magnitude of the gravitational force of the Earth on the ball? mg = Additional Materials section 2.2

Explanation / Answer

1) average velocity Vavg= V- V2 / 2 = 44 - 0 / 2

= 22 m /sec .. here V1 and V2 are velocitys just before collision and after collision

2) time lapse t = distance / Vavg

= 0.021/22 = 0.000954sec

3) Favg = mV1 - mV2 / t = 0.057 * 22 /0.000954 = 1314.4N

4)Fg = 0.057 * 9.8 m/sec2 = 0.558 N

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