Yeah, I know I'm using an unconventional meaning for k. Theres no ASCII
standard 'lambda', which is the conventional one for what I was using. I
prefer putting the spring length into the formula explicitly so that its
clear that the constant in the formula is constant for any spring of that
type.

-[in your formula k would be E*A]-
Yes, assuming that the spring was a bungee-cord or something. Obviously for
a curly spring, the function of force is a somewhat more complicated
function of E and A...

-Chris

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