I'm following this page, but the explaination it's for iphone simulator, i have the ipad simulator and the iphone os 3.2 in the xcode but when i try to follow the example and make it work for ipad get lots of errors in the box2d classes.
Here it's the source: http://www.drobnik.com/touch/2010/05/physics-101-uikit-app-with-box2d-for-gravity/
How can you setup the demo from that site to make it work in ipad and xcode?