L=L0*sqrt(1-v^2/c^2)
L0=L/sqrt(..)=4/sqrt(1-0.64)=4/0.6=6.7 m
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L=L0*sqrt(1-v^2/c^2)
L0=L/sqrt(..)=4/sqrt(1-0.64)=4/0.6=6.7 m