(a)Suppose you have a fixed charge of -15nC at point X. (b)Points a and b are at distances of 20cm and 40cm (c) the potential energy or a proton at A and B
(d) the speed at point B of a proton that was moving to the right at point A with a speed of 4.0 x 10^5 m/s
(e) the speed at point A of a proton that was moving to the left as point B with a speed of 1.0 x 10^5 m/s.
