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Paragraph: A subatomic particle X sponta...

Paragraph: A subatomic particle X spontaneously decays 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.
Determine the kinetic energy of particle B (relative to frame S).

A

109 MeV

B

206 MeV

C

140 MeV

D

249 MeV

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The correct Answer is:
A
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