A plane flies with a speed of 278 mps along a course which passes over an anti-aircraft gun on the ground. The airplane is at an altitude of 5390 m. If the muzzle velocity of the projectile is 735 mps with a slope of 4 vertical to 3 horizontal, determine the angle between the horizontal and the line of sight at which the projectile must be fired in order to hit the airplane during the upward motion of the projectile.

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Is it meters per second or miles per second?

meters per second

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