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Nonrelativistic addition: Mr. A observes the motion of the balls inside the rocket. Mr. A Sensor Throws balls The balls arrived simulta- neously at the front and back of the rocket! Nonrelativistic addition: Mr. B observes the motion of the balls inside the rocket from his space station. Since the balls are moving to- gether with the rocket, the velocity of the ball is increased by the velocity of the rocket toward the front of the rocket and decreased by the velocity of the rocket toward the back of the rocket. Therefore, the balls arrive "simulta- neously" (the lengths of the arrows indicate the difference in the velocities of the balls). Rocket velocity Mr. B The balls arrived "simulta- neously" at the front and back of the rocket! Figure 1-8: Newtonian velocity addition What Is Relativity? 45