Question

A toy rocket is launched vertically upward from ground level. This is represented as f(t) = -16t^2 + 128t where t is the time in second and f(t) is the height of the rocket in feet. When will the rocket hit the ground?

divide both sides by -16
0 = -16t^2 + 128t

0 = t^2 - 8t

0 = t(t-8t)

0 = t

0 = t-8

add 8 to both sides

8 = t

the rocket will hit the ground in 8 seconds.

can you tell me if I'm correct?

Answer 1

Yes, it is right.

Answer 2

no

Answer 3

what's wrong with it?

Answer 4

There's nothing wrong with it: it's correct.

Answer 5

Thanks!

Answer 6

Jennifer smart Gorl

Answer 7

stonks