v≤(rgtanθ)12\mathrm{v} \leq(\mathrm{rg} \tan \theta)^{\frac{1}{2}}v≤(rgtanθ)21
v≤(rgtanθ)\mathrm{v} \leq(\mathrm{rg} \tan \theta)v≤(rgtanθ)
v>(rgtanθ)12\mathrm{v}>(\operatorname{rg} \tan \theta)^{\frac{1}{2}}v>(rgtanθ)21
v>(rgtanθ)v>(r g \tan \theta)v>(rgtanθ)