Identical 50C charges are fixed on an x axis at x = + 3.0 m. A particle

Question:

Identical 50μC charges are fixed on an x axis at x = + 3.0 m. A particle of charge q = – 15μC 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,.2 J as it passes through the point x = 0, y = 4.0 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?