Figured out that momentum is conserved so I was wrong about my assumption that final kinetic energy would be 0, which in hindsight makes lots of sense.
[SOLVED] Two charged particles fired at each other.
Homework Statement
A proton and an alpha particle (q = +2.00e, m = 4.00u ) are fired directly toward each other from far away, each with an initial speed of 0.172c. What is their distance of closest approach, as measured between their...