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Homework Help: Mass the same for two reference frames

  1. Oct 7, 2012 #1
    1. The problem statement, all variables and given/known data

    There are two particles with rest masses m1 and m2. In the S frame they have velocities u1 and u2. Consider another frame, which we usually denote as the S0 frame, which has a velocity v in the S frame in the direction of increasing x (i.e., it is going to the right in the S frame). Show that the invariant (or rest or proper) mass of the system of two particles has the same value in the S and S0 frames (i.e., it is invariant under a Lorentz transformation). Recall that the system in the S frame has E = E1 + E2 and p = p1 + p2.

    2. Relevant equations

    Really not too sure, I was thinking the Lorentz transformation for mass, but I am uncertain how to begin this question. Any tips to how I can begin, that would be greatly appreciated.

  2. jcsd
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