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Problem 1 ----- Uniform electric field problem

A uniform electric field of magnitude 640 N/C exists between 2 parallel plates that are 4.0 cm apart. A proton is released from the positive plate at the same instant an electron is released from the negative plate.

a) Determine the distance from the positive plate at which the two pass each other (ignore the elecric attraction between the proton and electron) b) What if? Repeat part a for a Sodium ion (Na+) and a chloride ion (CI-).

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Here is the work I have on this one

accel = qE/m

q = particle charge

E = Electric field charge

m = mass of respective particle

p = proton

e = electron

The equations are similar in nature in a way to the kinematics. I get that. So....

xfp = (qpE/2mp) * t^2

xfp = (.04m - xfe)

xfe = (qeE/2me) * t^2

Now I get completely lost on the math.... 3 equations 3 unknowns, with t being equal in both. Solve for t....

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problem 2 ----- Electric Flux & Gauss Law

In the air over a particular region at an altitude of 500m above the ground the electric field is 120 N/C directed downward. At 600 m above the ground the electric field is 100 N/C downward. What is the average volume charge density in the layer of air between these two elevations? Is it positive or negative?

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And in this problem I am just unclear as to which specific concept is being addressed!