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    NO idea why I posted this in the Engineering forum. Can a mod move it please (to Maths)..



    Y = 0 by symmetry but when I try to manually work out y I do not get 0..

    I mean for the y-coordinate to be 0, the numerator in the formula for the y-coordinate has to equal 0, but this is not the case:



    F(x)2 = 4ax , and if you integrate this between the limits a and 0 you do not get 0..
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    Remember that y^2 = 4ax has both a y = 2sqrt(ax) part and a y = -2sqrt(ax) part.
 
 
 
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