# Aerodynamic drag on a cannonball?

I'm trying to build a ballistics simulation where I shoot a cannonball. I want to allow for drag and am trying to work out the math to do so.

I can work the drag out using $F = Cd\times S\times V^2\times A/2$.

What I need to know is how to find the X and Y parts of that. I use $V\cos(A)$ and $V\sin(A)$ to work out the X and Y velocities. Can I just use this to find the X and Y drag too?

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Yes, but remember that drag is in opposite direction of velocity. –  Pygmalion Jun 5 '12 at 10:37
Right now I would suggest editing your question and defining your variables, and maybe specify what part of this you're having trouble with a little better. I'm looking at terms like $cos(A)$ and really wondering what's going on. Is that area? Is that an angle? We need to see what you're thinking better. –  AlanSE Jun 5 '12 at 13:52