A string of length L and force constant ...

A string of length L and force constant K is stretched to obtain extension l. It is further stretched to obtain extension `l_1`. The work done in second stretching is

`1/2Kl_1(2l+l_1)`

`1/2Kl_1^2`

`1/2K(l^2+l_1^2)`

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

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