What happens to the bullet when you shoot in the air with a gun ? Everything goes high to a point and have to come down. This applies for the bullet too. The gravity of earth can't allow the bullet to get out of its reach. When you fire a gun into the air, it's bullet will go as high as it has force provided by the gun, but after reaching the maximum height it will fall. If there were no atmosphere a bullet fired up into the air would come back down with this same amount of energy but air resistance makes a big difference and cuts the final speed of the descending bullet.