Calculate the momentum and de-Broglie wave length of the electrons acceleration through a potential difference of $56\; v.$

Question

$\begin{array}{1 1} mv= 4.02 \times 10^{-24} kg ms^{-1}; \lambda = 1.67 A^{\circ} \\ mv= 4.02 \times 10^{24} kg ms^{-1}; \lambda = 16.7 A^{\circ} \\ mv = 4.02 \times 10^{-24} kg ms^{-1}; \lambda = 1.67 A^{\circ} \\ mv= 4.02 \times 10^{-24} gkms^{-1}; \lambda = 16.7 A^{\circ} \end{array} $