$\begin{aligned} & \mathrm{m}=800 \mathrm{~kg} \\ & \mathrm{r}=300 \mathrm{~m} \\ & \theta=30^{\circ} \\ & \mu_{\mathrm{s}}=0.2 \\ & \mathrm{~V}_{\max }=\sqrt{\operatorname{Rg}\left[\frac{\tan \theta+\mu}{1-\mu \tan \theta}\right]} \\ & =\sqrt{300 \times \mathrm{g} \times\left[\frac{\tan 30^{\circ}+0.2}{1-0.2 \times \tan 30^{\circ}}\right]} \\ & =\sqrt{300 \times 10 \times\left[\frac{0.57+0.2}{1-0.2 \times 0.57}\right]} \\ & \mathrm{V}_{\max }=51.4 \mathrm{~m} / \mathrm{s}\end{aligned}$