(Solved): A source charge is located at the center, and the dashed circles are equipotential lines marked "2.5 ...

A source charge is located at the center, and the dashed circles are equipotential lines marked "2.5 V" and "5.0 V." A particle with a 14-C charge is placed on one of the circles, initially at rest, and it drifts to the other circle. In units of joules, what is its kinetic energy when it reaches the other circle? Enter a numerical value to the nearest tenth, e.g., "3.6"; do not enter units.