1. The problem statement, all variables and given/known data http://img221.imageshack.us/img221/4861/figure1h.png [Broken] Mod note: Fixed the image link. Consider the rigid object shown in this image. Four masses lie at the points shown on a rigid isosceles right triangle with hypotenuse length 4a. The mass at the right angle is 3m, and the other three masses are m. They are labeled A,B,C and D as shown. Assume that the object is floating freely in outer space. Mass C is struck with a quick blow, directed into the page. Let the impulse have magnitude ∫F dt = P . What are the velocities of all the masses immediately after the blow? 2. Relevant equations The one given in the problem statement v=ω x r Torque = r x F ΔL=r ΔP 3. The attempt at a solution I think computing the CM of this system would be a good place to start. I think I need to use the angular impulse formula but I'm wondering which mass I should go after first. My intuition leads me to believe the velocity of mass A will be opposite that of mass C. Is this all reasonable?