A room with 31-m-high ceilings has a metal plate on the

Question

Solve the all parts of following problem given below:

Problem: A room with 3.1-m-high ceilings has a metal plate on the floor with V = 0V and a separate metal plate on the ceiling. A 1.5 g glass ball charged to 4.5 nC is shot straight up at 5.0 m/s.

Part A: How high does the ball go if the ceiling voltage is 3.0 × 10⁶ V?

Part B: How high does the ball go if the ceiling voltage is 2.9 × 10⁶ V?

I need help to find how high the ball goes if the ceiling voltage is 3.0 × 10⁶ V.