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Question: It was calculated that a shell when fired from a gun with a certain velocity and at an angle of elev...

It was calculated that a shell when fired from a gun with a certain velocity and at an angle of elevation 5π36\frac{5\pi}{36} radians should strike a given target. In actual practice it was found that a hill just prevented in the trajectory. At what angle of elevation should the gun be fired to hit the target.

A

5π36\frac{5\pi}{36}radians

B

11π36\frac{11\pi}{36} radians

C

7π36\frac{7\pi}{36}radians

D

13π36\frac{13\pi}{36} radians

Answer

13π36\frac{13\pi}{36} radians

Explanation

Solution

For two angles of projection ranges are same. i.e. for a + b = π2\frac{\pi}{2}