Question: A positive charge of 5.00 µC is fixed in place. From a distance of 3.70 cm a particle of mass 6.40 g and charge +3.50 µC is fired with an initial speed of 70.0 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?
Having trouble with this physics question, can you please explain with the answer.