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  Simple special relativity question

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So I was practicing and I stumbled across this question (7b). On the first picture you can see the problem and the solution given. The problem I have as you can see in the second picture is that I get a different answer and I don't know what I'm doing wrong, I even checked my answer on different frames. Could someone help me out, please?


asked Jan 31, 2021 in Theoretical Physics by loyaltea21 (0 points) [ no revision ]
recategorized Feb 4, 2021 by Dilaton

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