I'm sure he'll reply, but if I were to guess, even-numbered undergrad physics courses are the spring semester (see also: the calendar; it's May). At the 100 level, that's usually waves, thermodynamics, electricity and magnetism, circuits, light, and sometimes random other introductory bits like fluids, nuclear, quantum, aerodynamics, or other fun stuff.
I'd also guess a bit more and say he learned the blacks and inclined planes (kinematics) in Physics 103, which would be the preceding (and prerequisite) course.