Kinetic Energy
The work-energy theorem says the change in kinetic energy is equal to the work done on the body. In special relativity:
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Derivation
If in the initial state the body was at rest (γ0 = 1) and in the final state it has speed v (γ1 = γ), the kinetic energy is
a result that can be directly obtained by subtracting the rest energy m0c2 from the total relativistic energy γm0c2.
Read more about this topic: Relativistic Mechanics
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