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A ball is kicked from ground level into the air. Its height, y, in feet after x seconds can be represented by the equation y=40x - 16x^2. What is the total elapsed time, in seconds, from the time the ball is kicked until it reaches ground level again?

I used the quadratic formula and got 2.5. Is this correct?

  • math -

    if you did ...

    40x - 16x^2 = 0
    x(40 - 16x) = 0
    x = 0 or x = 40/16 = 2.5

    then you are correct

    the x = 0 , represents the time it was kicked

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