Posted by **Kaleigh** on Saturday, January 28, 2012 at 11:46pm.

A ball is thrown straight up from the ground

with an initial velocity of 30.4 m/s; at the

same instant, a ball is dropped from the roof

of a building 21.1 m high.

After how long will the balls be at the

same height? The acceleration of gravity is

10 m/s2.

Answer in units of s

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