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A fighter plane flying horizontally at a...

A fighter plane flying horizontally at an altitude of 1.5 km with speed 720 km/h passes directly overhead an anti - aircraft gun . At what angle from the vertical should the gun be fired for the shell with muzzle speed `600"ms"^(-1)` to hit the plane ? At what minimum altitude should the pilot fly the plane to avoid being hit ? (Take g=`10 " ms "^(-2))`.

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