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_{0}. At the same instant, a second ball is dropped from rest from a height H, directly above the point where the first ball was thrown upward. There is no air resistance. How to I find the time at which the two balls collide. A how do I find the value of H in terms of v

_{0}and g so that at the instant when the balls colide, the first ball is at the heighest point of its motion.

Anybody who can help?