Posted by **Gina** on Thursday, August 26, 2010 at 9:56pm.

If a ball is dropped from from 288 ft above the ground, how long does it take to reach ground level?

- math -
**MathMate**, Thursday, August 26, 2010 at 10:26pm
The distance S for a free falling object from rest over t seconds is:

S=(1/2)gt²

where

g=9.8 m.s^{-2}

S=288m

Solve for t.

solve for t.

- math -
**Quidditch**, Thursday, August 26, 2010 at 10:53pm
Be cautious about units on this problem. The problem gives the distance in feet. Gravitational acceleration in English units is about 32 ft/sec^2 .

- math -
**MathMate**, Thursday, August 26, 2010 at 11:33pm
Oops. Use g=32.2 f s^{-2}

Thanks Qudditch.

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