Let F be the force, K the spring and δ be the deflection, for a linear elastic spring, which of the following equations can be written?
1
\(\frac{1}{4}k{\delta ^2} = \frac{{{F^2}}}{k}\)
2
\(\frac{1}{2}k{\delta ^2} = \frac{{{F^2}}}{k}\)
3
\(\frac{1}{2}k{\delta ^2} = \frac{{{F^2}}}{2k}\)
4
\(k{\delta ^2} = \frac{{{F^2}}}{{4k}}\)