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K is the force constant of a spring. The...

`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

`K//2(l_(2) + l_(1))`

C

`K(l_(2)^(2) - l_(1)^(2))`

D

`(K)/(2)(l_(2)^(2) - l_(1)^(2))`

Text Solution

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The correct Answer is:
D
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