A charged particle is observed in two inertial reference frames. Which of the following statements is/are true about the particle? 1) Mass is invariant 2) Momentum is invariant 3) Charge is covariant

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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.