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

K is the force constant of a spring. The work done is increasing its extension from `l_(1)` to `l_(2)` will be

A

`K(I_(2)-I_(1))`

B

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

C

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