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The spaceship Lilac, based on the Purple Planet, is 751 m long when measured at rest. When the Lilac passes Earth, observers there measure its

The spaceship Lilac, based on the Purple Planet, is 751 m long when measured at rest. When the Lilac passes Earth, observers there measure its length to be 687 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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