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Jon is standing on a bridge over a creek. He releases a stone 20 feet from the water. How long will it take the stone to hit the water?

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The distance covered by a free-falling object in 'T' seconds after it's dropped is

D = (1/2) x (gravity acceleration) x (T²)

Gravity acceleration on Earth is 9.8 m/s². or 32.2 feet/sec² .

20-ft = (1/2) (16.1) (T²)

20 = 8.05 T²

T = √(20/8.05) = 1.576 seconds .
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