(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Q1 http://www.maths.ox.ac.uk/system/files/private/active/0/b07.2_c7.2.pdf [Broken]

2. Relevant equations

3. The attempt at a solution

How do I do the final bit that lead to the discrepancy and why does this occur? I have no idea where to begin.

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# Homework Help: Special Relativity- Lorentz contraction

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