A uniform electric field of magnitude 250 V/m is directed in the positive x direction. A +12-?C charge moves from the origin to the point (x, y) = (20 cm, 50 cm).
a) What is the change in the potential energy of the charge-field system?
b) Through what potential difference does the charge move?
c) If the particle mass is m = 0.01 kg, and it moves starting from rest, what is its speed when it passes the point (x, y) = (20 cm, 50 cm)?