Chapter S2, Problem 35EAP

To determine

To explain:

what people moving by you at very high speed will say about you? If you will say that their time runs slowly, their length are contracted in the direction of motion, and their masses are increased from their rest masses. (a) your time runs slowly, your length contracted in the direction of motion and your mass is increased from your rest mass. (b) your time runs fast, your length is expanded in the direction of motion and your mass is decreased from your rest mass (c) your time runs fast but your length and mass are unaffected.