Special Relativity (English) Special Relativity, Lecture 4: Adding Velocities (English) December 4, 2015 Teach Yourself Special Relativity with Dr. Pervez Hoodbhoy Lecture 4: Adding Velocities 1. How we usually add velocities 2. Relativistic addition of velocities 3. The usual Doppler shift 4. Relativistic Doppler shift 5. Problems