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11 July, 02:18

A starship blasts past the earth at 2.0*108m/s. Just after passing the earth, it fires a laser beam out the back of the starship. With what speed does the laser beam approach the earth?

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  1. 11 July, 05:49
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    The speed that the laser beam approaches Earth with is 299792458 m/s

    Explanation:

    The speed of light in any inertial reference frame is always c=299792458 m/s or 3*10⁸ m/s. This is because the speed of light is constant throughout the universe and this was proved in Einstein's theory of general relativity.
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