I drop a ball from height h above the ground. At the same time, my friend, standing directly below on the ground, throw a second ball upwards with speed v0. The two balls collide at the moment when the second ball (the ball that my friend threw) is instantaneously at rest. (a) Did I throw the ball, or did I just release it? (b) At what height did the collision take place?
1. I drop a ball from height h above the ground. At the same time, my friend, standing directly
below on the ground, throw a second ball upwards with speed v0. The two balls collide
at the moment when the second ball (the ball that my friend threw) is instantaneously at
rest.
(a) Did I throw the ball, or did I just release it?
(b) At what height did the collision take place?
(c) A wise old man tells you that if two rubbery balls of equal mass collide, with one ball
at rest, the velocity of the first ball just after the collision is the same as the velocity
of the second ball just before the collision (and vice versa). Sketch the distance
between the two balls as a function of time after the collision (until one of the balls
reaches the ground).
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