An electron is moving east in a uniform electric field of 1.47 {\rm n/c} directed to the west. at point a, the velocity of the electron is 4.55×105 {\rm m/s} pointed toward the east. what is the speed of the electron when it reaches point b, which is a distance of 0.355 {\rm 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 1.95×104 {\rm m/s}, again pointed towards the east. what is the speed of the proton at point b?