Question

The work done in stretching a spring of force constant k from length $l_{1}\ and\ l_{2}$ is
(a) $k(l_{2}^{2}-l_{1}^{2})$
(b) $\frac{1}{2}k(l_{2}^{2}-l_{1}^{2})$
(c) $k(l_{2}-l_{1})$
(d) $\frac{k}{2}(l_{2}+l_{1})$

Answer 1

Pta nii sorry.. Google