At war a fighter plane used forward firing machine guns mounted in the wings to fire at targets on the gro?

he 50 caliber machine guns fired bullets out their barrels at 775 m/s. If the pilot dove toward an opponent at 500km/hr (~139 m/s) and pulled the trigger, how fast did the bullets fly toward the enemy?

The bullets travel at 775 m/s out of the barrels. Since the barrels are moving towards the target, add the two speeds.
775m/s +139m/s = 914 m/s

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