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The Blitzer Bonus gives Einstein 's special-relativity equation
for the aging rate of an astronaut,
relative to the aging rate of a friend on Earth,
where v is the astronaut's speed and c is the speed of light. Take a few minutes to read the essay and then solve. You are moving at 80% of the speed of light. Substitute 0.8c in the equation shown above. What is your aging rate relative to a friend on Earth? If 100 weeks have passed for your friend, how long were you gone?
The relativistic addition of the velocities is given by the formula:
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