u22 g\frac{\mathrm{u}^{2}}{2 \mathrm{~g}}2 gu2
u22g\frac{u^{2}}{\sqrt{2} g}2gu2
3u22g\frac{\sqrt{3} u^{2}}{2 g}2g3u2
2u23g\frac{2 u^{2}}{\sqrt{3} g}3g2u2