Question

If an object is dropped from a height of 144 feet, the function h(t)=-16t2t+144 gives the height of the object after t seconds. When will the object hit the ground?

A. 9 s

B. 6 s

C. 1.5 s

D. 3 s

Answer 1

what it the position fundtion what is -162t2 ? do you mean \[-16t ^{2}+t\]

Answer 2

ok set it equal to zero and solve for t.

Answer 3

check it @Mr.Me

Answer 4

-16t^2+144=0
16t^2=-144
t^2=9
...

Answer 5

so t=+- 3 but -3 doesn't make sense so t=3s is good answer

Answer 6

so is it A or D

Answer 7

d because t^2=9 and t=3

Answer 8

okay thanks