Question: A student asserts that a material particle must always have a speed slower than that of light, and a massless particle must always move at

A student asserts that a material particle must always have a speed slower than that of light, and a massless particle must always move at exactly the speed of light. Is she correct? If so, how do massless particles such as photons and neutrinos acquire this speed? Can’t they start from rest and accelerate? Explain.

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