Question

Ce viteza trebuie sa aiba o particula ca masa ei sa creasca de 3ori fata de masa de repaus?

Answer 1

$\dfrac{m_0}{m}=\sqrt{1-\dfrac{v^2}{c^2}}\\ \\ \\ 1-\dfrac{v^2}{c^2}=\dfrac{1}{9}\\ \\ \\ v^2=\dfrac{8c^2}{9}\\ \\ \\ v=\dfrac{2\sqrt{2}c}{3}.$