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In a laboratory an electron is given a kinetic energy of .400 MeV and sent to...

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Physics

In a laboratory an electron is given a kinetic energy of .400MeV and sent to the right. A spacecraft moves to the right with aspeed of .50c with respect to the laboratory. What would be thekinetic energy of the electron as measured by someone in thespacecraft's frame of reference? The mass of an electron is9.11x10-31 kg and the mass energy of an electron is .511 MeV.

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The kinetic energy of a particle is given bywhere mc2 is the rest mass energy and is the Lorentz factorIn the laboratory frame K0400MeV Rest mass energy of electronis    See Answer
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