Explanation: When the electron moves with the given relativistic speed, it possesses energy, E = mc2. However, from relativistic point of view (as Einstein opined) this energy has two parts; one the mass of electron (energy and mass inter-convertible!) and the other K.E of the particle. So, to calculate the total mass we apply the above equation and to calculate the K.E we subtract the rest mass energy of electron from it.
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