A rubber ball is shot straight up from the ground with speed v_0 {\kern 1pt}. Simultaneously, a second rubber ball at height h directly above the first ball is dropped from rest.
(a) At what height above the ground do the balls collide? Answer should be a symbollic expression in terms of v0, h, and g.
(b) What is the maximum value of h for which a collision occurs before the first ball falls back to the ground?
(c) For what value of h does the collision occur at the instant when the first ball is at its highest point?

Question

A rubber ball is shot straight up from the ground with speed v_0 {\kern 1pt}. Simultaneously, a second rubber ball at height h directly above the first ball is dropped from rest. 
(a)  At what height above the ground do the balls collide?  Answer should be a symbollic expression in terms of v0, h, and g.
(b)  What is the maximum value of h for which a collision occurs before the first ball falls back to the ground?
(c)  For what value of h does the collision occur at the instant when the first ball is at its highest point?