A proton is shot perpendicularly at an infinite plane of

Question

Problem: A proton is shot perpendicularly at an infinite plane of charge. The charge density of the plane is 7.65 × 10^-4 C/m². If the proton starts out 1.05 mm from the plane,

Part A: What must its velocity be so that it screeches to a halt exactly as it reaches the plane?

I am need of complete solution for this problem please help- me out to get right solution.