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The work done by external agent in stret...

The work done by external agent in stretching a spring of force constant k from length `l_1` to `l_2`is

A

`k (l_2^2 - l_1^2)`

B

`1/2 k(l_2^2 - l_1^2)`

C

`k(l_2 - l_1)`

D

`1/2k(l_2 + l_1)`

Text Solution

Verified by Experts

The correct Answer is:
B
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