Question: the rocket will be launched vertically upward from ground level, and obviously it will go up for a little while then come down. I have

the rocket will be launched vertically upward from ground level, and obviously it will go up for a little while then come down. I have been told that the height in feet after t seconds can be found by the function

f(t)=-16t^2 +128t

we want to photograph it at the height 220 feet. Find time at which it will be at 220 feet of height?

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