$${v = \sqrt{\frac{8 k T}{\pi m}} = \sqrt{\frac{(8) (1,38 \times 10^{-23})(295)}{(3,14)(4,7\times 10^{-26})}} = 470 \mathrm{m/s}~~~~ \text{või} ~~~~ v = \sqrt{\frac{8 RT}{\pi M}}.}$$