Question: A spaceship is moving away from Earth with a constant velocity of 0.80c with respect to Earth. The spaceship and an Earth station synchronize their

A spaceship is moving away from Earth with a constant velocity of 0.80c with respect to Earth. The spaceship and an Earth station synchronize their clocks, setting both to zero, at an instant when the ship is near Earth. By prearrangement, when the clock on Earth reaches a reading of 1.0 × 104 s, the Earth station sends out a light signal to the spaceship.
(a) In the frame of reference of the Earth station, how far must the signal travel to reach the spaceship?
(b) According to an Earth observer, what is the reading of the clock on Earth when the signal is received?

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