Question: When traveling past an observer with a relative speed v, a rocket is measured to be 9.00 m long. When the rocket moves with a

When traveling past an observer with a relative speed v, a rocket is measured to be 9.00 m long. When the rocket moves with a relative speed 2v, its length is measured to be 5.00 m.
(a) What is the speed v?
(b) What is the proper length of the rocket?

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