Chapter 9, Problem 95PP

You’re interested in the intersection of physics and sports, and you recognize that many sporting events involve collisions—bat and baseball, foot and football, hockey stick and puck, basketball and floor. Using strobe photography, you embark on a study of such collisions. Figure 9.31 is your strobe photo of a ball bouncing off the floor. The ball is launched from a point near the top left of the photo and your camera then captures it undergoing three subsequent collisions with the floor.

FIGURE 9.31 Passage Problems 94-97

The fraction of the ball's mechanical energy that's lost in the second collision is

1. a. about 10%.
2. b. a little less than half.
3. c. a little more than half.
4. d. about 90%.