Chris Johnson wrote:
> [...]
> 

 'normal'
> length, where k is such that the force exerted by the spring is k*x and
 l is
> the normal length of the spring.



where x is the current length and l the unextended length.

in your formula k would be E*A (E=Young's modulus and A=cross section
), 
k by convention is E*A/l.

Christoph

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