A spring of force constant $K$ is first stretched by distance a from its natural length and then further by distance $b$. The work done in stretching the part $b$ is .............
A spring of force constant $K$ is first stretched by distance a from its natural length and then further by distance $b$. The work done in stretching the part $b$ is .............
- A
$\frac{1}{2} K a(a-b)$
- B
$\frac{1}{2} K a(a+b)$
- C
$\frac{1}{2} K b(2 a+b)$
- D
$\frac{1}{2} K b(a-b)$
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