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A certain spacecraft measures 60 m in length when it is at rest. The spacecraft then travels at 750% of the speed of light. Determine

A certain spacecraft measures 60 m in length when it is at rest. The spacecraft then travels at 750% of the speed of light. Determine the length of the spacecraft (a) according to a passenger onboard the ship.
A certain spacecraft measures 60 m in length when it is at rest. The spacecraft then travels at 75% of the speed of light. Determine the length of the spacecraft (a) according to a passenger on board the ship. (b) according to an Earthbound observer. Explain your answers

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