In terms of the intellectual demand placed on the student this excellent text-coming from the landmark serie of Textbooks by Sears and Zemansky is comparable to Halliday-Resnick-Walker/Krane, Serway-Beichner-Jewett, Tipler, Wolfson-Pasachoff but is a bit lower than
Anthony Philip French, MIT Physics Course, Vol 1-Newtonian Mechanics or Volume 1, Berkeley Physics Course or Vol 1, Feynman Lectures of Physics.
However the authors neglect the recoil kinetic energy of the
earth when calculating escape velocity from the Solar
system. In a paper of mine with A. P. French,
American Journal of Physics, 56, 85-86, 1988 we observe the
correct approach. To improve a bit the teaching of physics
we require more modeling with illustrative sequence.