Posted by **Cin** on Sunday, August 26, 2012 at 2:44pm.

A person drops a small rock from a bridge. If it takes 1.70 seconds for the rock to reach the water below the bridge, how high was the bridge above the water? please explain.

- Physics -
**drwls**, Sunday, August 26, 2012 at 2:54pm
The distance it falls in t seconds after being dropped is

H = (1/2) g t^2

g is the acceleration of gravity, which you must have learned about by now. It is 9.8 m/s^2 on Earth.

Set t = 1.7 seconds and use the formault to solve for the height, H, in meters.

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