Solve the following problem:
Problem: Two identical point charges (q = +7.40 x 10-6 C) are fixed at diagonally opposite corners of a square with sides of length 0.465 m. A test charge (q0 = -2.45 x 10-8 C), with a mass of 6.65 x 10-8 kg, is released from rest at one of the empty corners of the square.
Part A: Determine the speed of the test charge when it reaches the center of the square.
m/s
Express your knowledge to solve the above problem.