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First ball y=volt + .5(g)(t^2) second ball y=h+.5(g)(t^2). Am I solving for the wrong variable (you mentioned time)? Also does the derivative come into play? Sorry for all the questions, I've been up for a long time O_o.EDIT: Do you set them equal to each other? h+.5gt^2 = volt + .5gt^2 h = volt...

Homework Statement A rubber ball is shot straight up from the ground with speed vo. Simultaneously, a second rubber ball at height h directly above the first ball is dropped from rest. At what height above the ground do the balls collide? Your answer will be a symbolic expressions in terms...