[header] How to calculate the distance traveled by an object using vector kinematics [title] Determine the angle which the bullet is fired, relative to the ground. [step] This can be done using a simple mathematical compass. [title] Determine the initial (starting) velocity of the bullet as soon as it leaves the barrel of the gun. 
[step] This information can usually be found on the gun's package or the manufacturer's website. The initial velocity of the projectile varies, depending on the gun model and ammunition type.