Ballistics Question?

[goodgrouper]

"A bullet fired at double the normal speed will encounter double the air resistance." My understanding was squared resistance when doubling speed, but my memory isn't as good as it used to be. I forgot which law it was as well.

I thought Energy=massxvelocitysquared too but I have found both answers in research.
Here's a link talking about it. The doc at the bottom doesn't show the math but he says it doesn't square in this instance, it doubles. However, I found another that showed two different equations for sub sonic (non-turbulent) objects and another for supersonic objects.

Yahoo! Answers - Air resistance... Physics help ?