u2 g\frac{\mathrm{u}^{2}}{\mathrm{~g}} gu2
ug\frac{\mathbf{u}}{\mathbf{g}}gu
2ug\frac{2 \mathrm{u}}{\mathrm{g}}g2u
u22g\frac{u^{2}}{2 g}2gu2