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math-algebra

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A launched rocket has an altitude, in meters, given by the polynomial h = vt -4.9t^2, where h is the height, in meters, from which the launch occurs, at velocity v in meters per second, and t is the number of seconds for which the rocket is airborne. If a rocket is launched from the top of the tower 110 meters high with an initial upward speed of 60 meters per second, what its height be after 2 seconds?

  • math-algebra - ,

    If h is the height above ground level, then the equation will be

    h = -4.9t^2 + 60t + 110

    replace t with 2 and you got it.

  • math-algebra - ,

    I got 422.08 but it says that is still wrong can you help

  • math-algebra - ,

    h = -4.9(4) + 60(2) + 110
    = 210.4 m

    or 100.4 above the tower

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