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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 (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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