Hopefully you smart guys can understand this post I recently have bought an airsoft pistol that shoots 302fps and I thought it would be fun to calculate the max distance & stuff for the bb including air resistance. The problem is including air resistance into the equation. Here's the stats: mass of bb= .12g diameter of bb= 6mm (.006m) muzzle velocity for .12g bb = 302fps (92.0496m/s) After reading stuff on the net, I aparently need the equation D=(pCA)/2, where p is the density of air (about 1.2101 kg/m3), C is drag coefficient (around .47 probably?), and A is the area of the bb looking at front (pi*r2 = pi*(.003m)2 = 2.8274*10-5 m2) When I plug the numbers in, D= 8.04046*10-6 I'm sort of lost after this step, aparently Acceleration=-DV2 --> Ax=-DV(Vx) and Ay=-DV(Vy) I tried plugging the numbers in but the answer was only somewhere around .04 which I'm pretty sure isn't right at all. My main goal is to put it into a parametric function so I can see it visually with distance and time: SO, what I'm sure is right (without air resistance): X1T=92.0496cos(35) Y1T=92.0496sin(35)-(1/2)9.8T2 What is the air resistance acceleration and how do I plug it into that equation???