Dynamics Help Needed!! Relative velocities problem 1. The problem statement, all variables and given/known data see link: http://www.flickr.com/photos/55153239@N03/6199846646/ 2. Relevant equations Can you please help me solve this problem? I have 3 unknowns: Va, Vb, and Thetha; but only two equations Vb(cos(theta)) - Va(cos30) = 5.6cos70 Vb(sin(theta)) - Va(sin30) = 5.6sin70 I need a third equation???!?! 3. The attempt at a solution To get the two above equations, I took into account: Vb/a = Vb - Va Then I broke each vector into components. I end up with the two above equations. But I don't know where to go from here. I need a third equation either relating theta to Va or Vb, or a cable constraint equation, etc. I need some help.