The 5th edition of Thornton and Marion is famous for its deep dives into:
Mastering Physics: Why Students Search for the Marion & Thornton Classical Dynamics Solutions Manual The 5th edition of Thornton and Marion is
The instructor's solutions manual for the 5th edition of "Classical Dynamics of Particles and Systems" by Marion and Thornton is available online. However, I couldn't find a direct link to a free PDF version. The 5th edition of Thornton and Marion is