Homework Help: Physics

Posted by Anonymous on Tuesday, October 5, 2010 at 8:38pm.

A ball is thrown upward from the ground
with an initial speed of 21.5 m/s; at the same
instant, a ball is dropped from rest from a
building 17 m high.
After how long will the balls be at the
same height? The acceleration of gravity is
9.81 m/s2.
Answer in units of s.

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