Physics 211
Lecture 7
Video Problem 1

Video Demonstration
6 minutes and 59 seconds running time.
Video example #1, Lecture 7: You bounce two superballs together, with a 10 g ball on top of a 30 g ball. Assume that just before they hit the ground, they are moving with a speed 2 m/s downward. The large ball hits the ground first, and bounces upward with a velocity 2 m/s upward and collides with the small one that is still going downward at a speed of 2 m/s. Assuming an elastic collision, how fast is the small ball going after the collision?