Question

An object is dropped from 36 feet below the tip of the pinnacle atop a 360 ft tall building. The height h of the object after t seconds is given by the equation h = -16t^2 +324. Find how many seconds pass before the object reaches the ground

Answer 1

Explanation:

When the object reaches the ground, h = 0.

0 = -16t² + 324

16t² = 324

t² = 20.25

t = 4.5

It takes 4.5 seconds.