SOLUTION: the height of the rocket in feet above the ground after t seconds is modeled by the equation h = 60t - 16tsquared. how long was the rocket in the air before it returned to the grou

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Question 271098: the height of the rocket in feet above the ground after t seconds is modeled by the equation h = 60t - 16tsquared. how long was the rocket in the air before it returned to the ground?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
solve for t, when h equals zero

0 = 60t - 16t^2

0 = 4t (15 - 4t)

4t = 0 ___ t = 0 ___ this is the starting point

15 - 4t = 0 ___ 15 = 4t ___ 3.75 = t ___ this is the landing