An electron is moving east in a uniform electric field of 1.45 N/C directed to the west. At point A, the velocity of the electron is 4.49×10^5 m/s pointed toward the east. What is the speed of the electron when it reaches point B, which is a distance of 0.385 m east of point A?
A proton is moving in the uniform electric field of part A. At point A, the velocity of the proton is 1.87×10^4 m/s, again pointed towards the east. What is the speed of the proton at point B?