A pine cone falls from a tree branch that is 144 feet above the ground. After how many seconds does the pine cone land on the ground?

GAMEMASTERX40
Apr 7, 2018

#1**+1 **

You would use the "Formula for falling bodies" :

d =1/2 x G x t^2, where d = distance fallen, G=Acceleration due to gravity =32.2 ft/s^2, t=time taken.

144 = 1/2 x 32.2 x t^2

144 = 16.1 x t^2 divide both sides by 16.1

8.944 = t^2 take the square root of both sides

t = sqrt(8.944)

t = 2.99 = ~3 seconds - time it takes the pine cone to hit the ground.

Guest Apr 7, 2018