Problem 13 An electron passes right in the middle of 2 protons at an unknown velocity Vi. Because the protons attract the electron, the electron will decelerate and stop a distance xf from the middle between the 2 protons. Look at the picture on your right hand side for all the information necessary. Assume that the two protons are fixed in place and that they will not change their position as the electron attracts them in return. What is the electron's velocity v: as it passes through the middle of the two protons