SOLUTION: I'm having trouble with this problem: When Victor shoots a model rocket into the air, the height of the rocket above the ground is a function of time. The equation that can be use

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Question 139120: I'm having trouble with this problem:
When Victor shoots a model rocket into the air, the height of the rocket above the ground is a function of time. The equation that can be used to represent this situation is +h=-16t%5E2%2B320t+, where h is the height in feet and t is the time in seconds. What is the maximum height the rocket reaches? How long does it take the rocket to fall back to the ground from liftoff?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
the maximum value of h is at the vertex of the parabola, which is on the axis of symmetry

the equation for the axis of symmetry is x=-b/2a, or in this case t=-320/(2*(-16)) __ t=10

so h=-16(100)+320(10) __ h=1600

time down equals time up, equals 10