Solution to 1986 Problem 70

The formula for the relativistic length contraction is
\begin{align*}L = L_0 \sqrt{1 - v^2/c^2}\end{align*}
Plug in L_0 = 4 \mbox{ m} and v = 0.8 c (the result of the previous problem), to find that L = 2.4 \mbox{ m}. Hence answer (A) is correct.

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