A particle which has zero rest mass and non-zero energy and momentum must travel with a speed

Particle is photon and it travels with the velocity equal to light in vacuum

m= 0

\(m=\frac{m_{0}}{\sqrt{1-\frac{v^{2}}{c^{2}}}}\) \(1-\frac{v^{2}}{c^{2}}=0\)

∴ v = c

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