The problem statement, all variables and given/known data Bob is trying to hit a stationary target 146.00m downrange, his eyes are 1.8m above the ground, firing from a standing position. The muzzle velocity of the projectile is 382.524m/sec (1255 ft/sec), wind is negligible; at what firing angle must he fire to successfully hit the target? The target is 1m above the horizontal. DATA Variables T: projectile flight time in seconds V: projectile velocity (m/s) g: gravity in m/s^2 a (theta): required firing angle in degrees Test/develop environment: Controlled Overview: Set up markers to a distance of 200m, 1 marker per 25m Program will not compensate for cross-winds, humidity, etc. Required information: 1)Drag factor 2)Launch angle 3)Initial velocity 4)Gravity (Default: 9,8022m/s^2) 5)Shape of parabola Variables: T: Projectile flight time in seconds V: Projectile velocity in m/s g: gravity in m/s^2 a: Required firing angle in degrees Test-caliber: Winchester Wildcat .22 High Velocity Point: Solid Bullet weight: 40 grains (2.59196 grams) Muzzle velocity (m/s): 382.524 Velocity @ 100m: 1017 (18.96% decrease Muzzle energy (ft/lbs):139.82 Energy @ 100m (ft/lbs):91.82 (34.33% decrease) Ballistic coefficient: .100 Attempt at a solution: Would I use this formula to find the angle of elevation? "Angle θ required to hit coordinate (x,y)" @ http://en.wikipedia.org/wiki/Trajectory_of_a_projectile θ = tan-1((v2 +/- ((v4-g(gx2+2yv2)))0.5)/gx) The above formula does not compensate for air resistance, so should I scrap that formula and seek an alternative derivation?