In a head-on collision the car stops in 0.23 rm s from a, Ask an Expert

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Q1. A spacecraft passes you travelling forward at 0.236 speed of light. By what factor would its relativistic momentum increase if its speed doubled?

Q2. In a head-on collision, the car stops in 0.23 {rm s} from a speed of 17 {rm m}/{rm s}. The driver has a mass of 77 {rm kg}, and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second?

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