SOLUTION: The formula s=16t^2 is used to approximate the distance, s, in feet that an object falls freely in t seconds. Use this formula to sole the problem: A man drops his keys off a bui

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: The formula s=16t^2 is used to approximate the distance, s, in feet that an object falls freely in t seconds. Use this formula to sole the problem: A man drops his keys off a bui      Log On


   



Question 210320: The formula s=16t^2 is used to approximate the distance, s, in feet that an object falls freely in t seconds. Use this formula to sole the problem:
A man drops his keys off a building 1420 feet high. How long does it take the keys, falling freely to hit the ground?

Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Set s = 1420.
1420+=+16t%5E2 Divide both sides by 16.
88.75+=+t%5E2 Take the square root of both sides.
9.42+=+t
It takes 9.42 seconds.