v2sin2θ2g\frac{v^{2} \sin ^{2} \theta}{2 g}2gv2sin2θ
v2sinθg\frac{v^{2} \sin \theta}{g}gv2sinθ
v2sinθ2g\frac{v^{2} \sin \theta}{2 g}2gv2sinθ
2vg\frac{2 \mathrm{v}}{\mathrm{g}}g2v