m1 and m2 only interact gravitationally. They are initially at rest and a distance L apart. They where then released. Where and when will they collide?
The Attempt at a Solution
For the where part, my argument is that initially at the CM frame, the total momentum is zero, therefore, they must collide at the origin of the CM frame. I think this is not a good argument.
For the time part, I have no clue. I mechanics is really weak. Despite being a physics major I am not required to take any classical mechanics course to graduate.