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Suppose a train is moving at a speed of 0.82c in the +x direction relative to...

Suppose a train is moving at a speed of 0.82c in the +x direction relative to the ground. (a) Someone on the train launches a ball at speed of 0.62c in the +x direction relative to the train. What is the x component of the ball's velocity relative to the ground? (b) Another ball is launched with an x component of velocity of -0.3c relative to the train. What is the x component of this ball's velocity relative to the ground?

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