A. An electron is moving east in a uniform electric field of 1.48{\rm N/C} directed to the west. At point A, the velocity of the electron is 4.54×105{\rm m/s} pointed toward the east. What is the speed of the electron when it reaches point B, which is a distance of 0.350{\rm m} east of point A?
B. A proton is moving in the uniform electric field of part A. At point A, the velocity of the proton is 1.95×104{\rm m/s} , again pointed towards the east. What is the speed of the proton at point B?