Electric Potential problem escape veloctiy.

[PhysicsGnome]

Homework Statement

http://www.phy.mtu.edu/~gagin/2200/textfiles/ph2200-ex2-f05.pdf
#23

Homework Equations

My attempt at the equation:
Vi = sqrt(2/m * ((K*1.5nC*e/.005m) + (K*1.5nC*e/.005m)))

The Attempt at a Solution

My equation gives me a value that is too large. Any help appreciated.

I noticed if I change the 2/m to 1/m and divide my final answer by 2 it is a value around the size of the answer...

 

[Astronuc]

The kinetic energy must equal the electric potential energy (EPE) of the proton at the current position, which seems to be the approach one has taken.

Then one can determine the v from KE.

Getting the EPE correct is the key. The proton is equidistant between two equal charges.

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elepe.html