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Math Help - inequality/quadratic!!!

  1. #1
    Member i_zz_y_ill's Avatar
    Joined
    Mar 2008
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    140

    inequality/quadratic!!!

    the condition is that v is bigger or equal to 0

    ive got ((0.2)v^2)/2 + 0.2g x 2.4 + 5((2.4 - L)^2)/2L = (5 x 1.6^2)/(2 x 0.8)

    the answer given from here which i have no idea where it came from is:
    L^2 -6.1184L + 5.76 smaller or equal to 0

    implies 1.162 smaller or equal to L smaller or equal to 4.956

    L bigger or equal to 1.162

    I have no idea like i said where this working came from or how it works despite being in the mark scheme. If anyone coukd show me how this was derived you'd be saving my life i have an exam tomorrow and im sure this'll come up thnx
    Last edited by i_zz_y_ill; May 19th 2008 at 07:58 AM. Reason: rong
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