Posted by eric on Monday, August 8, 2011 at 2:34am.
V = -g*t, where
g = 9.8 m/s^2 (on Earth)
The minus sign is because the acceleration is in the negatve direction, assuming + is up.
V(t=3s)= -29.4 m/s
Air resistance has been neglected. That will slow it down.
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