Thread: Mechanics Question - Velocities of an object

Hey all,

I am having trouble answering the question that follows:

Two particles, of mass m and 3m, are connected by a light rigid rod. The system rests on a smooth(no friction) horizontal table, the heavier mass due east of the lighter mass. The heavier mass is projected with initial velocity u directly north. Find the velocities of the particles when the rod runs north-south.



I have attached an image to clarify the setup. I would really appreciate an explanation of how to do it or even just any help you can give.

Thanks All

First find the motion of the center of mass. Then work in the center of mass frame - you have 2 particles going in circles around the center of mass.