An important idea in relativity is to know when you can use classical mechanics and when you should use relativity. The relativistic and classical formulas for kinetic energy are: T_relativistic = E - moc² and T_classical = 1/2mov² = 1/2moc²beta². At what fraction of the rest energy is the classical formula valid to within 2%? Express your answer as: T/m0c^2 = 1/a
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