Beta decay is nuclear decay in which an electron is emitted from an atom. If the electron is given 0.75 MeV of kinetic energy, what is its velocity, as a fraction of the speed of light? You will have to assume the electron is moving relativistically.

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A: The speed of the first spaceship, u1 = 0.7cThe speed of the second spaceship, u2 = 0.9c

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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.