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Velocity of a laser pulse with respect to earth.

A spaceship travels with a speed 0f .6c as it passes Earth. Sometime after passing earth the pilot shoots a laser pulse backward at a speed of 8*10^8 meters/second with respect to the spaceship.

What is the speed of the pulse as measured on earth?

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According to Einstein's principle of constancy of speed of light,

' The speed of light in free space has the same ...

Solution Summary

A conceptual question based on relativity.