The Figure Shows a Right-Angled Construction Frame ABC

The figure shows a right-angled construction frame ABC. When measured at rest, it has dimensions as follows: AB = 18.9 m, AC = 10.0 m, and BC = 16.0 m. This frame is now given a new velocity of 0.420c, relative to Earth, in a direction parallel to AC. How long is part BC of this frame with the new velocity as measured by Earth-based engineers?

A) 16.0 m
B) 14.0 m
C) 12.0 m
D) 10.0 m
E) 18.0 m

Correct Answer:

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