A point-like negatively charged particle of mass m and charge -q is initially released from rest from the point P along the positive z-axis where the magnitude of the electric field is largest.

(a) What is the distance from the point P to the origin? Express your answers in terms of the following variables , if relevant, q ,m ,R ,Q , and epsilon_0 .

unanswered



(b) What is the speed of the particle when it reaches the origin? Express your answers in terms of the following variables , if relevant q ,m ,R ,Q , and epsilon_0 .

Please some one answer.