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Two identical spaceships with proper lengths of 175 m are launched from Earth. Spaceship A is launched in one direction at 0.500c and spaceship

Two identical spaceships with proper lengths of 175 m are launched from Earth. Spaceship A is launched in one direction at 0.500c and spaceship B is launched in the opposite direction at 0.750c. a. What is the speed of spaceship B relative to spaceship A? b. What is the length of spaceship A as measured by astronauts on spaceship B?

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