v = \sqrt{\frac{2 E}{M_{D}}} = \sqrt{\frac{2 \times 1, 6 \cdot 10^{- 14}}{3, 34 \cdot 10^{- 27}}} = 3, 1 \cdot 10^{6} m s^{- 1}

${v=\sqrt{\frac{2E}{M_D}}=\sqrt{\frac{2 \times 1,6\cdot 10^{-14}}{3,34 \cdot 10^{-27}}} =3,1 \cdot 10^6\, \mathrm{ms^{-1}}}$

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