Name: Anonymous 2008-02-28 21:18
Ok, a sphere of evenly distributed charge Q has a particle at the center with kinetic energy K1 and a radius of R. If the particle comes to rest at the edge of the sphere, how much time did it take to travel the distance R? (Hint: keep in mind that the acceleration due to the charge varies, as each time it moves it encompasses more of a gaussian sphere, and therefore field.)