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David wants to go to Wolf 359, a local star 7.9 light years away. David wants...

David wants to go to Wolf 359, a local star 7.9 light years away. David wants to get there in 3 years in his own frame, so he goes on a very fast rocket and makes use of time dilation. If he has a mass of 90 kg, what is his kinetic energy while he is on the spaceship according to somebody in the Earth frame? Express the KE in units of kg/c2 (in other words, in units where c=1).

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