An observer measures the length (L), width (w), and height (h) of a box while stationary...
An observer measures the length (L), width (w), and height (h) of a box while stationary relative to the box. The observer then travels at near light speeds parallel to the length (L) of the box. If the observer measures the length (L) of the box while moving, the measured value is
equal to L.
less than L.
greater than L.
More information is needed.
You need to know the density of the box.
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