I'm looking for a good physics library for XNA. Can anyone help me find something good, simple and easy to learn for XNA?
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Farseer Physics is a great free XNA physics engine. The community on codeplex is quite active and there is plenty of help here at stack aswell.
It is derived from the Box2D which has a very helpful user guide. Box2D is in C++ but it is a fairly simple read.
If your just getting started physics engines may feel like they are really over the top and can be quite hard to get your head around, but stick to it and you will have a huge amount of fun.