A room with 3.0-m high ceilings has a metal plate on the floorwith V=0V and a separate metal plate on the ceiling. A 1.0 gglass ball charge to 4.9 nC is shot straight up at 5.0 m/s. How high does the ball go if the ceiling voltage is
(a) 3.0*10^6 Vand
(b) -3.0*10^6? Physics