Need help with real world math problems?

Question

For problems 7 – 8, use the Falling Object Model (Object is dropped not thrown) h = -16t2 + s where h = height, t = time (seconds) and s = initial height. In each problem below, remember, h = 0 when the object hits the ground!


7. You drop your keys from a window 30 feet above ground to your friend below. It will it take
______ seconds for the keys to reach the ground when your friend does not catch them,


8. An acorn falls 45 feet from the top of an oak tree. How long will it take to reach the ground? _____

Answer 1

7. 0 = -16t² + 30

8. 0 = -16t² + 45