It was calculated that a shell when fired from a gun with a certain velocity and at an angle of elevation 5$\mathrm{\pi }$/36 radians should strike a given target. In actual practice it was found that a hill just intervened in the trajectory. At what angle of elevation should the gun be fired to hit the target ?

• A

  $\frac{5\mathrm{\pi }}{36}\mathrm{radian}$

• B

  $\frac{7\mathrm{\pi }}{36}\mathrm{radian}$

• C

  $\frac{11\mathrm{\pi }}{36}\mathrm{radian}$

• D

  $\frac{13\mathrm{\pi }}{36}\mathrm{radian}$