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wackyscience

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**Relativity problem solving help! time dilation**

http://courses.physics.illinois.edu/phys225/sp2013/homework/225-hwk01.pdf

Please click on the top link ^ to see the questions. I have already solved them and turned it in, however i would like to see how others would approach the questions and what mathematical manipulations are widely accepted for solving relativity problems.

Please answers 1-4. and please give a few words of reasoning for your answer Thank you in advance.