Hello again im here seeking help again b`cuz i cant find out how to make physics effects simulation such like rectilinear uniform movement, angular, gravity well i will explain the problem: i`ve found a ping-pong game code and works, but the real deal its how to make the simulation of the physic effects when the ball get hit by the racket, like the kick off of one player. Also i will need help with 2 more stuff how to interpret the forces in newtons, the speed and the distance. and try to make a display of that stuff don't know if its possible. Well sorry for my bad grammar English its not my native language i hope u have understand the problem Tnks for your time and will wait for help Saludos. PD. if someone can help me via msngr could be better ;) The project files http://rapidshare.com/files/302497726/Ping-pong-xna.rar.html

You might want to look at a physics library, like Bepu Physics or JigLibX (for 3D) or Farseer (for 2D).

Firts tnkx for the anwer.  
Well i have Farseer engine but my real problem its how to make it work with the current code that i post in rapidshare. In other word i need a tutorial to include this engine. 

hope have feed back ;)  gracias..