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(Solved): A particle at rest with mass \( M_{A} \) decays into three identical particles with rest mass \( M_ ...
A particle at rest with mass \( M_{A} \) decays into three identical particles with rest mass \( M_{B} \) and with velocities as shown in the diagram below. (a) If \( v_{1}=4 / 5 \mathrm{c} \) and \( \theta=30^{\circ} \), then what is the magnitude of \( v_{2} \) ? (b) If \( M_{B}=3 \mathrm{GeV} / c^{2} \), then what is the value of \( M_{A} \) ?