What is the formula for velocity vector i wll brain u if ur fast at it

Two identical 82 mg dust particles very far apart (pee 0) are moving directly toward each other at a speed of 3698 m/s. the charge on each is-719 ? c. determine how close they will get to each other. let k = 9x109 n-m2/c2 & ignore gravity.

Describe uniform velocity and variable velocity in short

Anybody wanna ? (picture included? )