Three charged particles of q, = 10.0 nC, q, = -10.0 nC, and q; = 5.0 nC are placed on the y-axis, as shown in the figure. + 93 + X 92 Charge q, has the coordinates (0, 4.00 cm), q2 has the coordinates (0, -4.00 cm), and q3 is located at the origin. (a) Find the electric potential energy (in ]) of the configuration of the three fixed charges. (b) A fourth particle, with a mass of 2.25 x 1072 kg and a charge of 94 = 20.0 nC, is released from rest at the point (3.00 cm, 0). Find its speed (in m/s) after it has moved freely to a very large distance away. m/s