A free electron is moving with a velocity of 3 × 105 m/s. It strikes a stationary electron in a head-on elastic collision. The mass of an electron is 9.1093 × 10-31 kg. What will be the magnitude and direction of the momentum of the stationary electron, post-collision? A) 273.279 × 10-25 kg. m/s, in the same direction as the incident electron
B) 273.279 × 10-25 kg. m/s, in the opposite direction as the incident electron
C) 279.273 × 10-25 kg. m/s, in the same direction as the incident electron
D) 279.273 × 10-25 kg. m/s, in the opposite direction as the incident electron