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QUESTION
A particle with mass m has speed c!2 relative to inertial frame S. The particle collides with an identical particle at rest relative to frame S.
A particle with mass m has speed c!2 relative to inertial frame
S. The particle collides with an identical particle at rest relative to
frame S. Relative to S, what is the speed of a frame S' in which the
total momentum of these particles is zero?
