What changed with the newest version of the physics book from the 2009 version you have it that:
- 1) Tricks and techniques discussed in the lecture course were added.
- 2) The B-questions now have detailed answer explanations.
- 3) Several chapters (all of book 2 basically) were augmented based on student feedback. This includes adding several summaries and pictures, especially in the circuits chapter and the light and optics chapter.
- 4) About 40% of the passages and questions were rerplaced with ones that were written in the last few years.
- 5) Every answer explanation was critiqued by multiple people and changed if it needed more POE added in.
- 6) Some of the excessive math and derivations were neutered.
- 7) Examples that cross over to other disciplines were incorporated into each chapter.
The book just reads better and has a better system of passages and questions than before.
Whether you should get it comes down to budget versus need. You bought used books rather than new ones, so I assume paying $250 to $275 instead of $295 made a difference at the time you were first buying books. If money is not a consideration, then I'd get the new books as soon as I could. If money is a concern, then don't worry too much, because you still have a darn good book. I think the newest physics books (and the newest organic chemistry books which came out a few weeks ago) are better than the older ones. They reflect the current MCAT and have many passages that have been written recently.