What are the some applications of General Equation?

Some applications of General Equation (A) Projection from a height at an angle $\theta$ above horizontal : $u_{x}=u \cos \theta \quad \quad u_{y}=-u \sin \theta$ $x=(u \cos \theta) t \quad a_{y}=+g$ $h=(-u \sin \theta) t+\frac{1}{2} g t^{2}$ $g t^{2}-(2 u \sin \theta) t-2 h=0$ $\mathrm{t}=\frac{+2 \mathrm{u} \sin \theta \pm \sqrt{(2 \mathrm{u} \sin \theta)^{2}+8 \mathrm{hg}}}{2 \mathrm{~g}}$ or $\quad t=\frac{u \sin \theta}{g} \pm \sqrt{\left(\frac{u \sin \theta}{g}\right)^{2}+\frac{2 h}{g}}$ (B...