1. The problem statement, all variables and given/known data A charge of -1.8 µC is fixed in place. From a horizontal distance of 0.0450 m, a particle of mass 2.25 10-3 kg and charge -1.7 µC is fired with an initial speed of 65.0 m/s directly toward the fixed charge. How far does the particle travel before its speed is zero? 2. Relevant equations q(V) = 1/2mv^2 (??) 3. The attempt at a solution I'm afraid I'm very lost on this one. I messed around with the equation for collisions a bit but I can't seem to get in the right direction much less get the answer. I would be grateful if you guys could provide me with some hints to get started >.< thanks!