The spaceship Lilac, based on the Purple Planet, is 741 m long when measured at rest. When the Lilac passes Earth, observers there measure its length to be 681 m. At what speed v is the Lilac moving with respect to Earth? Express your answer as a multiple of the speed of light c.

Physics for Scientists and Engineers: Foundations and Connections
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Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter39: Relativity
Section: Chapter Questions
Problem 24PQ: A starship is 1025 ly from the Earth when measured in the rest frame of the Earth. The ship travels...
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The spaceship Lilac, based on the Purple Planet, is 741 m long when measured at rest. When the Lilac passes Earth, observers there measure its length to be 681 m. At what speed v is the Lilac moving with respect to Earth? Express your answer as a multiple of the speed of light c.

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