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should still apply, along with the formula for the total energy of a particle:
:This equation shows that the total energy of a particle (bradyon or tachyon) contains a contribution from its rest mass (the "rest mass-energy") and a contribution from its motion, the kinetic energy. When ' (the particle's velocity) is larger than ' (the speed of light), the denominator in the equation for the energy is imaginary, as the value under the square root is negative.

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