What a great exam this year... I particularly loved #3, the quantitative-qualitative translation question in which students have to work through a non-constant torque graphically and conceptually. The paragraph question which combines energy and momentum concepts is likely to show up at our year-end conceptual physics tournament in the near future.
My solutions can be found at this TEACHERS ONLY link. Yes, really, teachers only. If you ask for access as a student or parent, Gardner, who runs that site, will take away your birthday, and for extra measure, he'll lay a little spell on you right there. He'll turn you into stone, or a dog, or a chair.
Teachers, if you'd like access, please follow the instructions at the site. Send Gardner a request to join, along with evidence that you are a physics teacher.
The official solutions will be available in the fall on the College Board's AP central website. I'll be grading problem 3 - woo-hoo! (No, I've no clue yet what the rubric will look like, just that I'll be grading thousands upon thousands of problems 3.)