Which of the following is true for elastic potential energy density
AEnergy density $=$ $\frac{1}{2} \times {\rm{strain}} \times {\rm{stress}}$
BEnergy density $=$ ${{\rm{(strain)}}^2} \times {\rm{volume}}$
CEnergy density $=$ $strain$ $\times$ $volume$
DEnergy density $=$ $stress$ $\times$ $volume$
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AEnergy density $=$ $\frac{1}{2} \times {\rm{strain}} \times {\rm{stress}}$
a (a) Elastic potential energy per unit volume is given by
$u=\frac{1}{2} \times$ stress $\times$ strain
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