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What work has to be performed in order to increase the velocity of a particle of rest mass mo from 0.60 c to 0.80 c?

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What work has to be performed in order to increase the velocity of a particle of rest mass mo from 0.60 c to 0.80 c? Compare the result obtained with the value calculated from the classical formula.

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The work done is equal to change in kinetic energy which is different in the two cases Classically i.e. in nonrelativistic mechanics, the change in kinetic energy is

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