Problem $8\mathrm{.}142$ i

A basketball with mass $m=0\mathrm{.}6kg$ is rolling without slipping as shown when it hits a small step with $l=7cm.$ Letting the ball's diameter be $r=12\mathrm{.}0cm,$ modeling the ball as a thin spherical shell $($the mass moment of inertia of a spherical shell about its mass center is $\frac{2}{3}m{r}^2),$ and assuming that the ball does not rebound off the step or slip relative to it$,$ determine the maximum value of $v_0$ for which the ball will roll over the step without losing contact with it$.$