u22 g\frac{\mathrm{u}^{2}}{2 \mathrm{~g}}2 gu2
u2 g\frac{\mathrm{u}^{2}}{\mathrm{~g}} gu2
u2 g\frac{{\mathrm{u}}}{2 \mathrm{~g}}2 gu
2ug\frac{2 \mathrm{u}}{\mathrm{g}}g2u