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Physics, 24.02.2021 04:40 meababy2009ow9ewa

1. When you are 20 years old, you watch Superman (age 40.0) leave Earth on an important mission. He is capable of flying at 2.70 x 10^8 m/s. He finally arrives back at Earth when you are 62.0 years old. How old is Superman? (Please show steps for both) 2. Rick is filming a movie in space and he is travelling so fast that he appears to you on earth to have 9.00 times his normal mass. How fast is he travelling?

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