An electron moving along the x axis has an initial speed of 1 × 106 m/s at the origin. its speed is reduced to 5 × 105 m/s at the point xp , 3 cm away from the origin. calculate the magnitude of the potential difference between this point and the origin. the mass of the electron is 9.109 × 10−31 kg and the elemental charge is 1.602 × 10−19 c. answer in units of v.