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    Twin Paradox from Moving Reference Frame- Return Journey

    So how would I implement this as equations? Something like the ball travels from ##(L,L/u)## in Alice's coordinates to ##(0,2L/u)## and then transform these points to Bob's reference frame and use the velocity of the ball as seen by Bob? Or is there something else I'm missing?
  2. B

    Twin Paradox from Moving Reference Frame- Return Journey

    Homework Statement a) Alice is observing a small ball of mass m in relativistic motion bouncing elastically back and forth between two parallel walls separated by a distance L with speed u. After each collision it reverses direction, thereby creating a clock. What does Alice observe as the...
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