electrostats

two circular rings A and B , each of radius a=130 cm are placed co-axially with their axes horizontal in a uniform electric field E=10^5 N/C directed vertically upwards distance between the centers of these rings A and B is h=40 cm ring A has positive charge =10 micro C while ring B has negative charge of magnitude = 20 micro C. A partical of mass m =100 gm and carrying a positive charge =10 micro C is realesed from rest at the center of the ring A. Calculate its velocity when it has moved a distance of 40 cm