Part 2 part a and b I meant to show all work step by step don't getting short cut

2. (10 points) Three -4.0 uC charges are distributed as shown below. -4.0 uC 2.0 cm, 2.0 cm -4.0 uC 2.0 cm -4.0 MC a. (4 points) Calculate the electrostatic potential energy of the system of charges. b. (6 points) All three charges have a mass of 3.6 x 10-8kg, and are released from rest in the configuration shown above. What is the final speed of each particle after the particles are infinitely far away from each other