57. A spaceship travels at a speed of 0.5c for 5 years according to an observer on Earth. How much time passes for the passengers on the spaceship according to their own clocks? A. 2.5 years B. 3.5 years C. 4.33 years D. 5 years 58. The time dilation formula for special relativity is given by: A. tt0 * √(1-v^2/c^2) B. tt0/√(1-v^2/c^2) C. L = LO* √(1-v^2/c^2) D. L = LO/ √(1-v^2/c^2) 59. A spaceship is traveling at 0.9c relative to an observer on Earth. What is the velocity of the spaceship according to another observer traveling at 0.7c in the same direction as the spaceship, using the relativistic velocity addition formula? A. 0.2c

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