(Answered) A a spacecraft that moves away from the earth with a speed

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A) A spacecraft that moves away from the earth with a speed of 0.800c and fires a space probe in the direction of its movement with a speed of 0.650c. What is the velocity of the probe relative to the earth?

B) an exploratory ship attempts to reach the spacecraft traveling at 0.850c relative to the earth. What is the speed of the exploring ship with respect to the spacecraft?

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