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

K is a force constant of a spring. The work done in increasing its extension from `l_1` to `l_2` will be

A

(A) `K(l_1-l_2)`

B

(B) `(K(l_1-l_2))/2`

C

(C) `K(l_2^2+l_1^2)`

D

(D) `(K(l_2^2-l_1^2))/2`

Text Solution

Verified by Experts

The correct Answer is:
D
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