Physics Question?

A stretched spring has a total length of 20 cm and a springconstant of 200 N/m. It is storing 0.25 J in its elastic potentialenergy store. Determine t

A stretched spring has a total length of 20 cm and a spring
constant of 200 N/m. It is storing 0.25 J in its elastic potential
energy store.
Determine the unstretched length of the spring. ??
I believe the formula the may be required is : W = (1/2)kx2
Any help appreciated.

or:A stretched spring has a total length of 20 cm and a springconstant of 200 N/m. It is storing 0.25 J in its elastic potentialenergy store. Determine the unstretched length of the spring. ??I believe the formula the may be required is : W = (1/2)kx2Any help appreciated.

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