Question

A small rock falling from the top of a 124-ft-tall building with an initial downward velocity of –30 ft/sec is modeled by the equation h(t) = –16t2 – 30t + 124, where t is the time in seconds. For which interval of time does the rock remain in the air?
t = 2
t > –2
t < 2
t > 2

Answer 1

any thoughts?

Answer 2

T<2?

Answer 3

plug in 0 what do you get

Answer 4

into the equation

Answer 5

you are correct I believe.

Answer 6

hold on

Answer 7

t=2

Answer 8

THank you so much!

Answer 9

When you plug in t=2, you get 0, when it hits the ground, it remains in the air for 2 seconds

Answer 10

medal and fan?