If a stone is to hit a point which is at a distance d away and at a height h above the point from where the stone starts, then what is the value of initial speed u if the stone is launched at an angle $\mathrm{\theta }$ ?

• A

  $\frac{\mathrm{g}}{\cos \mathrm{\theta }}\sqrt{\frac{\mathrm{d}}{2(\mathrm{dtan}\mathrm{\theta }-\mathrm{h})}}$

• B

  $\frac{\mathrm{d}}{\cos \mathrm{\theta }}\sqrt{\frac{\mathrm{g}}{2(\mathrm{dtan}\mathrm{\theta }-\mathrm{h})}}$

• C

  $\sqrt{\frac{{\mathrm{gd}}^2}{{\mathrm{hcos}}^2\mathrm{\theta }}}$

• D

  $\sqrt{\frac{{\mathrm{gd}}^2}{(\mathrm{d}-\mathrm{h})}}$