Question

Two particles, with charges of 20 nC and -20nC, are placed at thepoints with coordinates (0, 4 cm) and (0, -4 cm). A particle withcharge 10 nC is located at the origin.
(a) Find the electric potential energy of the configuration of thethree fixed charges.
(b) A fourth particle, with a mass of 2.00*10^-13 kg and a chargeof 40 nC is released from rest at the point (3 cm, 0). Find itsspeed after it has moved freely to a very large distanceaway.

Thanks ahead of time, guys/gals.