# jennifer - Grand Canyon

posted by
**Damon**
.

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