I am trying to plot the trajectory of a projectile. I found formulas for finding the drag force, but it only gives me the drag force at an impossibly short interval of time, i need it to affect the trajectory of the projectile threw out it's path. The projectile is also affected by gravity. If anyone could help me out here, either by giving me a different drag formula or even better, in the form of y=, that would be great. This formula is going into a program to calculate and graph the path of projectiles fired out of compressed air powered spud guns.