Question 331224
A ball is dropped from a height of 150ft how long will it take for it to reach the ground? 
objects fall at a rate 32.2ft per second per second (32.2ft squared)
:
The average rate of fall from a dropped object: {{{1/2}}}*32.2 = 16.1 ft/sec
:
h = -16.1t^2 + 150
where
h = height of a dropped object after t seconds
h=0 when it hits the ground
-16.1t^2 + 150 = 0
-16.1t^2 = -150
Divide both sides by -16.1
t^2 = +9.31677
t = {{{sqrt(9.31677)}}}
t = 3.05 sec