# physics

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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 -

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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