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Air Cannon Velocity Calculator . You fire a projectile from a air cannon being held 1.5 meters from the ground at an angle of 42°. The velocity calculations in our second data table were calculated using the formula v=u+at. for Visiting Monday Kids Air Rifle Gun Chronograph from www.mondaykids.com You fire a projectile from a air cannon being held 1.5 meters from the ground at an angle of 42°. In the time it takes for the cannonball to fall 1 km, at orbital velocity, the cannonball will have to had travelled 113.77 km so that earth has curved away from it by 1 km. Vc 2012 american association of physics teachers.