# Question: suppose you have a fixed charge of 15nc at point...

###### Question details

Suppose you have a fixed charge of -15nC at point X. Points a and b are at distances of 20cm and 40cm from X: Point X--------PointA--------PointB Calculate the following:

(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.