Particle projection, momentum. Somewhat urgent. 1. The problem statement, all variables and given/known data I didn't properly explain myself last time. I've included a diagram for reference. Two particle of masses m and 3m are connected by a light rigid rod. The system rests on a smooth horizontal table, the heavier mass due east of the lighter mass. The heavier mass is projected with initial velocity [tex]u j^>[/tex]. Find the velocities of the particles when the rod runs north-south. 2. Relevant equations Energy, momentum. 3. The attempt at a solution I applied momentum to the upward direction, and then applied conservation of energy. I end up with too many variable and am quite unsure how to solve this problem. any hints would be greatly appreciated.