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27 February, 06:01

If a toy rocket is launched vertically upward from ground level with an initial velocity of 128 feet per second, then its height h after t seconds is given by the equations h (t) = - 16t squared + 128t (if air resistance is neglected).

How long is the rocket in the air?

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Answers (1)
  1. 27 February, 08:34
    0
    8 seconds

    Step-by-step explanation:

    Just use the quadratic equation, but remember, use only positive answer (s). Time can't be negative.
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