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**Calc help plz!!!**

Can someone plz help me how to do this problem using calculus? Thanks a lot.

A ball is dropped out of a window 19.6m above the ground. At the same time another ball is thrown straight down from a window 79.6m above the ground. If both balls reach the ground at the same moment, find the initial velocity of the second ball.

***position = s(t)= -16t^2 + ct +d