Problem: A positive charge of 4.10 µC is fixed in place. From a distance of 4.90 cm a particle of mass 6.90 g and charge +3.60 µC is fired with an initial speed of 78.0 m/s directly toward the fixed charge.
Part A: How close to the fixed charge does the particle get before it comes to rest and starts traveling away?
Please provide correct solution for above problem.