An elastic string of unstretched length $L$ and force constant $k$ is stretched by a small length $x$. It is further stretched by another small length $y$. The work done in the second stretching is
An elastic string of unstretched length $L$ and force constant $k$ is stretched by a small length $x$. It is further stretched by another small length $y$. The work done in the second stretching is
- A
$\frac{1}{2} Ky ^2$
- B
$\frac{1}{2}Ky(2x+y)$
- C
$\frac{1}{2}K(x^2+y^2)$
- D
$\frac{1}{2} k(x+y)^2$
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