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18 December, 21:48

After t seconds, the height h (t) of a model rocket launched from the ground into the air is given by the function below h (t) = - 16t2 + 80t how long does it take the rocket to reach a height of 96 feet?

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  1. 18 December, 23:21
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    96=-16t^2 + 80t

    t^2 - 5t + 6 = 0

    t=2 or 3

    Hence it take 2 seconds
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