Paragraph: A subatomic particle X spontaneouslydecays into two particles, A and B, each of rest energy 1.40xx10^(2)MeV. The particles fly off in opposite directions, each with speed 0.827c relative to an inertial reference frame S. Which one of the following statements concerning particle X is true?

Paragraph: A subatomic particle X spontaneouslydecays into two particl

1.	Paragraph: A subatomic particle X spontaneouslydecays into two particles, A and B, each of rest energy 1.40xx10^(2)MeV. The particles fly off in opposite directions, each with speed 0.827c relative to an inertial reference frame S. Which one of the following statements concerning particle X is true?
Answer» Momentum conservation requires that it was moving in FRAME S. ENERGY conservation requires that it must have been at REST in frame S. Momentum conservation requires that it must have been at rest in frame S. Energy conservation requires that its TOTAL energy was 280 MeV in frame S. Answer :C

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