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It was calculated that a shell when fired from a gun with a certain velocity and at an angle of elevation \( \frac{5 \pi}{36} \)
\( \mathrm{P} \)
W rad should strike a given target in the same horizontal plane. In actual practice, it was found that a hill just prevented the trajectory. At what angle of elevation should the gun be fired to hit the target.
(1) \( \frac{5 \pi}{36} \mathrm{rad} \)
(2) \( \frac{11 \pi}{36} \mathrm{rad} \)
(3) \( \frac{7 \pi}{36} \mathrm{rad} \)
(4) \( \frac{13 \pi}{36} \mathrm{rad} \).
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