According to relativity theory a particle of mass m with a momentum of 2mc has a speed of:
A) 2c
B) 4c
C) c
D) c/2
E) 0.89c

Name: According to relativity theory a particle of mass m with a momentum of 2mc has a speed of: A) 2c B) 4c C) c D) c/2 E) 0.89c
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Question

Quizplus · Accepted Answer

According to relativity, momentum p = γmv, where γ is the Lorentz factor. Given p = 2mc, solving for v using the relativistic momentum formula gives v ≈ 0.89c.

According to Relativity Theory a Particle of Mass M with a Momentum