The spaceship which is measured to be 50 m long by the captain. When the spaceship past a space dock at 0.5c, space dock personnel measure the rocket ship to be 43.3 m long. What is the proper length? A. 13.3 m B. 43.3 m C. 50.0 m D. 93.3 m

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A: Given data as per question speed = 0.990c t = 3.5* 108

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