Question

h=-16t^2+48t describes the rocket's height,h, in feet, from the ground, t seconds after it was launched. A. What is the height of the rocket after 2 seconds. B. After how long will it take the rocket to return to the ground.

Answer 1

simply sub t = 2 into your equation and do the math.

at ground level, h = 0
0 = -16t^2 + 48t
16t^2 - 48t = 0
t^2 - 3t = 0
t(t-3) = 0
t = 0 ---> at the start it is at ground level
or
t = 3

state your conclusion