Ok, I tried to apply directly the equations. However, to do efficient pathfinding in a platform game we need to take into account the collisions...
Assuming that I would want to clone Farseer world and to use it to test a way there are 2 majors issues :
1) Is it possible to run farseer in accelerated speed (like 100x or 1000x real time ?) or better ask to the engine "what will be the state of the world in 100ms ?"
2) I will basically have to clone the world every AI update (probably every 100ms), do you have any idea about how heavy it will be (the project targets the XBox) ?