Due to gravity, an object fall 16t^2 feet in t seconds. You drop a backpack from a window that is 100 feet above the ground. Will the backpack hit the ground in 3 seconds?

Answer 1

-16t^2 +100 = 0

16t^2 =100

t^2 = 100/16

t = 10/4 = 2.5 seconds to hit the ground

at 3 seconds, it will have been on the ground for half a second