it was calculated that a shell when fired from a gun with a certain velocity and at an angle of elevation 5 pi/ 36 rad should strike a given target in the same horz. 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 .
a) 5 pi/36 rad. b) 11 pi/36 rad
c) 7 pi/36 rad c) 13 pi/36 rad