# Homework Help: Particle projection, momentum. Somewhat .

1. May 19, 2010

### Maybe_Memorie

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 $$u j^>$$. 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.

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