Review: Limits
In the theory of relativity, the mass of a particle with velocity v is
\(\sf m = \large \frac{m_0}{\sqrt{1 − v^2/c^2}}\)
where \(\sf m_0\) is the mass of the particle at rest and c is the speed of light. What happens as \(\sf v → c^−\)?

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Let me rephrase the question: What happens to m as
\(\sf v → c^−\)?

so m will approach 0 or +infinity? not sure. i think positive infinity right?

as \(v\to c\), the denominator is approaching \(0\), so the "relativistic" mass approaches +infinity

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