A subatomic particle A decays into two identical particles B, A=B + B particles. The two B are observed to have exactly equal and opposite momenta of magnitude P. i) What can be deduced about the velocity of A just before the decay? ii) Derive an expression for the mass mOA, of A in terms of mOB and PB.

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.