Length contraction comparison · CAP 2015 #25

Physics

Problem

Two objects, A and B, appear to be the same length in a reference frame when A is stationary and B is moving with speed 3c5\frac{3c}{5} along its length. In the frame of reference where B is stationary and A is moving, what is the ratio of their lengths? a) LALB=54\frac{L_A}{L_B} = \frac{5}{4} b) LALB=1625\frac{L_A}{L_B} = \frac{16}{25} c) LALB=45\frac{L_A}{L_B} = \frac{4}{5} d) LALB=925\frac{L_A}{L_B} = \frac{9}{25} e) LALB=2516\frac{L_A}{L_B} = \frac{25}{16}

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