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A spaceship passes you at a speed of 0.85c. Youmeasure its length to be 17.3 m. How long would it be when atrest?

What is the SPEED of a beam of muons if their averagelifetime is measured to be 8.3×10-6 s? At rest,their lifetime is 2.2×10-6 s.

A woman on a rocket traveling at 0.62c (withrespect to Earth) observes a meteor come towards her and pass herat 0.91c. How fast is the meteor moving with respect toEarth?

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