physics
posted by Brittany .
A student drops a ball from the top of a tall building; the ball takes 2.4 to reach the ground. What was the ball’s speed just before hitting the ground? (this is excluding everything like air resistance, etc)

physics 
MathMate
Assuming it takes 2.4 seconds to reach the ground, the final speed is
2.4*9.81 m/sec²
=23.5 m/s.
In fps units, multiply by 32.2 ft/sec².
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