A) \[\frac{{{P}^{2}}L}{2AE}\]
B) \[\frac{P{{L}^{2}}}{2EI}\]
C) \[\frac{P{{L}^{2}}}{AE}\]
D) \[\frac{{{P}^{2}}L}{AE}\]
Correct Answer: D
Solution :
\[U=\frac{1}{2}\times stress\times strain\times volume\] \[=\frac{1}{2}\times \frac{P}{A}\times \frac{P}{AE}\times AL\] \[=\frac{1}{2}\times \frac{{{P}^{2}}L}{AE}\]
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