Question

I need help figuring out how to do this! Help is welcome :)
11. If and object is dropped from a height of 144 ft, the function h(t)=-16t^2+144 gives the height of the object after t seconds. When will the object hit the ground? (1 point)

a. 1.5 s
b. 3 s
c. 6 s
d. 9 s

Answer 1

set h=0

Answer 2

h(t)=-16t^2+144
h(t)=0
then 16t^2=144
t=3

Answer 3

Thank you guys :)

Answer 4

... so 16t^2=144