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Question 9

From Physics HL Paper 1A (May 2025, TZ1)

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  1. Observer X sees a spacecraft moving in the positive xx-direction at a speed of 0.50c0.50c.
    Observer Y sees the same spacecraft moving in the negative xx-direction at a speed of 0.50c0.50c.
    What is the speed of Y in the frame of reference of X?

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