u22 g\frac{\mathrm{u}^{2}}{2 \mathrm{~g}}2 gu2
2u2g\frac{2 u^{2}}{g}g2u2
u22 gsinα\frac{\mathrm{u}^{2}}{2 \mathrm{~g}} \sin \alpha2 gu2sinα
u22gcosα\frac{u^{2}}{2 g} \cos \alpha2gu2cosα