Posted by **Anonymous** on Friday, May 28, 2010 at 1:45pm.

A ball is thrown straight up from the ground with speed . At the same instant, a second ball is dropped from rest from a height , directly above the point where the first ball was thrown upward. There is no air resistance.

Question- Find the value of in terms of and so that at the instant when the balls collide, the first ball is at the highest point of its motion.

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