Rest mass energy of an electron is $0.51\  MeV.$ If this electron is moving with a velocity $0.8\ c$ (where $c$ is velocity of light in vacuum), then kinetic energy of the electron should be. ........... $MeV$

  • A

    $0.28 $

  • B

    $0.34$

  • C

    $0.39$

  • D

    $0.46$

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