Helium Nucleus is Accelerated

3. A helium nucleus is accelerated from rest through a potential difference V to a kinetic energy of X ∙ 10⁻¹³ J. What is the potential difference V? X is some number. Answer: V = E/q = E/(2e) = X ∙ 10⁻¹³ J / (2∙1.60×10⁻¹⁹ C) =  0.312X MV