posted by So Confused .
A proton is moving toward a charge of + 2.8 nC. On its way in to the charge it passes Point B at 4.5 cm from the charge and then passes Point A at 1.2 cm as it gets closer to the charge.
a. What is the potential difference between points B and A?
b. What is the change in potential energy between points B and A?
c. If the speed of the proton at point B was 5.8x105 m/s, what is its speed at point A?