FörberedandeFysik

\displaystyle \gamma = \displaystyle\frac{l}{l'} = \displaystyle\frac{1{,}0 \textrm{ m}}{0{,}30 \textrm{ m}} \displaystyle \Rightarrow v=c \sqrt{1-(1/\gamma)^2} \approx 0{,}95c_0 \textrm{ m/s} \displaystyle \Rightarrow v \approx 2{,}9\cdot 10^8 \textrm{ m/s}