## Physics: Principles with Applications (7th Edition)

We know that $PE_{elastic}=\frac{1}{2}(\frac{EA}{L_{\circ}}dL)$ Thus; $PE_{elastic}=\frac{1}{2}(\frac{2.0\times 10^6(0.5\times 10^{-4})}{3.0\times 10^{-3}})\times 1.0\times 10^{-3}=1.7\times 10^{-2}J$