Question

If an object is dropped from a height of 144ft, the function h(t) = -16t^2 + 144 gives the height of the object after t seconds. When will the object hit the ground?

Answer 1

am i right to interpret this as when h(t)=0 the object has hit the ground

Answer 2

if h(t) is the height right, then when the object hits the ground there will be no height, aka height =0.
So when h(t) =0, 0=-16t^2+144
16t^2=144
t^2=9
t=+9 or -9 (rejected since time>0)

Answer 3

@wcrmelissa2001 Well. the options are:
1.5s
3s
6s
or 9s