Posted by **Damon** on Thursday, October 16, 2008 at 2:56pm.

d = (1/2)g t^2

in feet, seconds units g = 32 ft/s^2 approximately

so

d = 16 t^2

t^2 = d/16

t = (1/4)(sqrt d)

if d = 5280

t = .25 (sqrt 5280)

= .25 * 72.7

=18.2 seconds

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