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
u22 gcosα\frac{\mathrm{u}^{2}}{2 \mathrm{~g}} \cos \alpha2 gu2cosα