Posted by **eric** on Monday, August 8, 2011 at 2:34am.

A tennis ball is held stationary and then dropped from the roof of a tall building. What will be its velocity after 3.0 s?

- science 10 -
**drwls**, Monday, August 8, 2011 at 6:01am
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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