1. The problem statement, all variables and given/known data an electron moving along the x axis has a position given by x=19te^-4t m, where t is in seconds. how far is the electron from the origin when it momentarily stops. 2. Relevant equations velocty=delta x / delta t 3. The attempt at a solution i think its a instantaneous velocity question but im not sure. i think you have to take the derivative of the equation. If somebody could just head me in the right direction then i could attempt to solve it.