In Newtonian Mechanics, the Newtonian Kinetic Energy KEN of a particle with mass m and velocity v is defined as 1 KEN=mv². 2 In Einstein's Theory of Relativity, the Total Energy of such a particle is defined as mc² √1-(v/c)²¹ where c≈ 3.0 x 108 meters/sec, and the Relativistic Kinetic Energy KER is defined as E= KER E-mc² = mc² 1 √1-(v/c)²
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