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Math Help - Parabolic equation of a bridge

  1. #1
    RAz
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    Parabolic equation of a bridge

    Just want to make sure I'm on the right track.

    I'm using y=ax^2 where a<0 for the bridge.

    Data (arbitrary units):
    Height 90
    Length 500

    90=a(\frac{500}{2})^2

    -a=0.00144

    \therefore y=-(0.00144)x^2

    Or is there a better way of doing this?
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  2. #2
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    Your answer is correct.
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