railway RRB JE (CBT I + CBT II) Mock Test 2024 Strength of Materials Strain Energy

A bar of length L and cross section A is subjected to axial forces P at ends. The energy stored in the bar will be.

1
\(\frac{{{P^2}L}}{{2AE}}\)
2
\(\frac{{{P^2}{L^3}}}{{2AE}}\)
3
\(\frac{{{P^2}{L^2}}}{{2AE}}\)
4
\(\frac{{{P}{L^3}}}{{2AE}}\)
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