1. The problem statement, all variables and given/known data An electron is released a short distance above the surface of the Earth. A second electron directly below it exerts an electrostatic force on the first electron just great enough to cancel the gravitational force on it. How far below the first electron is the second? M 2. Relevant equations F = G(MeMp)/r^2 F = Ke|q1||q2|/r^2 3. The attempt at a solution I am not sure how to attempt this problem but this is what i thought. F = (6.67 x 10^-11) (9.11 x 10^-31)(1.67 x 10^-27)/r^2 my problem there is i dont know how to find F to solve for r. its the same way if i use the other formula I still dont know F to solve for r. I don't understand this at all and what numbers am i suppose to find to do this.