# Use s = 16t² The Grand Canyon skywalk is 4000 ft above the Colorado River. How long will it take a stone to fall from the skywalk to the river?

Use $s=16t²$
The Grand Canyon skywalk is 4000 ft above the Colorado River. How long will it take a stone to fall from the skywalk to the river?
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insonsipthinye
Using the given formula, substitute s=4000 and solve for t: $4000=16{t}^{2}$
Divide both sides by 16:
$250={t}^{2}$
Take the square root of both sides:
$\sqrt{250}={t}^{2}$
t~15.8 seconds.