## Physics: Principles with Applications (7th Edition)

The particle’s kinetic energy is given by equation 26-5. At low speeds (relative to c), this is basically the same as the classical formula. As v approaches c, the value of $\gamma = \frac{1}{\sqrt{1-v^{2}/c^{2}}}$ approaches infinity. It is not possible for a nonzero mass particle to reach the speed of light.