intermediate algebra

A model rocket Is launched from a height of 50ft. The formula h=-16t^2+70t +50 describes the rocket's height,h,in feet seconds after it was launched. How long will it take the rocket to reach to reachthe ground?

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asked by Nellie
  1. When it's at the ground h = 0

    -16t^2+70t+50 = 0

    using the quadratic formula
    t=5
    t=-.625

    t cannot be negative, so t=5s is the correct answer.

    http://www.regentsprep.org/regents/math/algtrig/ate3/quadformula.htm

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    posted by DonHo

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