1. The problem statement, all variables and given/known data Positive point charge (Q = XXX μC, mass m = XXX g) is fixed at point (Y2 cm,0). A second identical charge q is constrained to slide on a friction-less wire along the y-axis. Assume: the only force on q is the electrostatic force. If q starts at (0, YYY) and is released from rest, find its speed when it reaches (0,YYY cm), in m/s. 2. Relevant equations W = ΔV * q ΔV = -kQ (1/r2 - 1/r1) ----( this equation was already derived from integrating with limits A to B - ∫ E * dr ) W = ΔK 3. The attempt at a solution I understand, sort of, that I need to find energy needed to move the charge for that distance (y2 - y1). In order to get that, I need to find ΔV so that I could multiply the answer to charge q and make it equal to [(1/2) (m*Vf^2)] to get the Vf. I used ΔV = -kQ (1/r2 - 1/r1) and I got ΔV = 104500. 5716 V. Used [W = ΔV * q] to get W. Then set W = 1/2 mvf^2. Found vf = 2.647 m/s Is this an OK logic to solve this problem? :/ I need an advice regarding the formulas I am using... not the correct answer... Thank you.