Identical 50 JC charges are fixed on an x axis at x = 13.4 m. A particle of charge q = -18 UC is then released from rest at a point on the positive part of the y axis. Due to the symmetry of the situation, the particle moves along the y axis and has kinetic energy 1.5 J as it passes through the point x = 0, y = 3.6 m. (a) What is the kinetic energy of the particle as it passes through the origin? (b) At what negative value of y will the particle momentarily stop