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Two spaceships travel toward one another at speeds of 0.7c and 0.8c,
each wrt to an inertial Earth observer – at what speed does each
spaceship observer see the other spaceship approach? Answer is 0.96c,
maintaining the necessary result that “no object can travel at the
speed of light.”
However, wrt Earth observers, the closing speed of
the two spaceships is in fact 1.5c.