When an elastic material with Young's modulus \( \mathrm{Y} \) is P...

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When an elastic material with Young's modulus \( \mathrm{Y} \) is
P subjected to a stretching stress S, the elastic energy stored per

D. unit volume of the material is
a. \( \frac{Y S}{2} \)
b. \( \frac{S^{2} Y}{2} \)
c. \( \frac{S^{2}}{2 Y} \)
d. \( \frac{S}{2 Y} \)
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