Suppose that an object has a mass-energy of 200 joules when it is at rest.
a. What is its total energy when it is moving with a velocity of 0.9c? (E = γE₀. See table 20.1.)
b. What is the kinetic energy of the particle at this speed? (KE  = E - E₀)

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table 20.1 Values of y for Different Values of Relative Speed v v = 0.010 V y = 1.000 05 V = 0.1c Y = 1.005 V = 0.5c Y = 1.155 Y = 1.250 Y = 1.667 V = 0.6c %3! %3D V = 0.8c V = 0.9c %3D y = 2.294 V = 0.99c %3D Y = 7.088