When strain is produced in a body within the elastic limit,its internal energy:

The force constant of a wire is $k$ and that of another wire is $2k$. When both the wires are stretched through the same distance,then the work done is:

Identical springs of steel and copper are equally stretched. On which more work will have to be done?

$A$ metallic rod of length $L$ and cross-sectional area $A$ is made of a material of Young's modulus $Y$. If the rod is elongated by an amount $y$,then the work done is proportional to ......

The energy stored in a strained wire is given by

What is called elastic potential energy? Write its different formulas.