Physics - Rotation Question with Solution | TestHub

One end of an ideal spring is fixed at point O and other end is attached to a small disc of mass m which is given an initial velocity ${\mathrm{v}}_0$ perpendicular to its length on a smooth horizontal surface. If the maximum elongation in spring is $\frac{{\ell }_0}{4}$ then ( ${\ell }_0=$ natural length and $\mathrm{k}=$ stiffness of spring)