An infinitely long line of charge has linear charge density 5.00 X 10-12 C/m. A proton (mass

Question:

An infinitely long line of charge has linear charge density 5.00 X 10-12 C/m. A proton (mass 1.67 X 10-27 kg, charge + 1.60 X 10-19 C) is 18.0 cm from the line and moving directly toward the line at 1.50 X 103 m/s.
(a) Calculate the proton's initial kinetic energy.
(b) How close does the proton get to the line of charge?