This reminds me of University Physics by Young and Freedman. The things I already understood were really dumbed down, and the things I didn't understand were inscrutable. I ended up using it as a door stop for the rest of the year until it fell apart and I had to throw it away. It was one of the first ones where the book came with a code that you had to use online to do the homework, so the book was also useless as second hand, after being useless when bought new.
