A room with 2.9m high ceilings has a metal plate on the floor with V= 0V and a separate metal plate on the ceiling. A 1.2g glass ball charged to 4.9nC is shot straight up at 4.8 m/s .
How high does the ball go if the ceiling voltage is 3.5×10^6V?
How high does the ball go if the ceiling voltage is ?3.3×10^6V?