No fool. At the point when it is fired the gun is aimed perfectly horizontally. That is being fired from a horizontal plane.<quoted text>
Level plane of equal hight but you keep factoring in the fired bullet must travel horizontal so its a fixed plane of equal hight now ? A level plane does not mean you cant fire down it just means they both start exactly level and equal to each other
And yes, by definition, if a plane is horizontal there is no downward component to it.