u2/2 g\mathrm{u}^{2} / 2 \mathrm{~g}u2/2 g
u2/gu^{2} / \mathrm{g}u2/g
u/g2\mathrm{u} / \mathrm{g}^{2}u/g2
u/2 g2\mathrm{u} / 2 \mathrm{~g}^{2}u/2 g2