v2sin2θ2g\frac{v^{2} \sin ^{2} \theta}{2g}2gv2sin2θ
v2sin2θg\frac{v^{2} \sin ^{2} \theta}{g}gv2sin2θ
v2sinθ2k\frac{v^{2} \sin \theta}{2 k}2kv2sinθ
2v8\frac{2 v}{8}82v