$K$ is the force constant of a spring. The work done in increasing its extension from ${l_1}$ to ${l_2}$ will be
$K$ is the force constant of a spring. The work done in increasing its extension from ${l_1}$ to ${l_2}$ will be
- A
$K({l_2} - {l_1})$
- B
$\frac{K}{2}({l_2} + {l_1})$
- C
$K(l_2^2 - l_1^2)$
- D
$\frac{K}{2}(l_2^2 - l_1^2)$
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