I have a conceptual question to ask of you. Suppose you have a point mass moving in a straight line at any arbitary speed with no net external force, so the particles speed does not change. At a later time, the point mass has a completely inelastic collision with another point mass, which causes both points to rotate around an axis with a constant radius. Now my question, will the momentum of the first point mass be equal to the product of the two point masses times the tangental velocity of the two masses? mathmatically: m1*v(i)=(m1+m2)*v(tangental) ?