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 ballâ€™s speed just before hitting the ground? (this is excluding everything like air resistance, etc)

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.