In the theory of relativity, the mass of a particle is

$$ m = \dfrac{m_0}{\sqrt{1 - v^2/c^2}} $$

where $ m_0 $ is the rest mass of the particle, $ m $ is the mass when the particle moves with speed $ v $ relative to the observer, and $ c $ is the speed of light. Sketch the graph of $ m $ as a function of $ v $.