Solve the all parts of give question:
Question: A proton is shot directly away from an infinite charged plane which has a uniform surface charge density of -5.17 x 10-6 C/m2. The proton's initial velocity is 2.41 x 106 m/s.
Part I: How much charge is located within a 1.69cm2 area of the infinite sheet?
Part II: How far does the proton travel before reaching its turning point?
I need help to find how far the proton travels before reaching its turning point.