The problem statement, all variables and given/known data[/b] An actor of mass 65.0 kg wishes to make a grand entrance onto a stage during a play. He attaches himself to a cable having length R=5.00 m. A stagehand gives the actor a push, imparting an initial speed onto the actor at heigh 1.5 m above the lowpoint of his ensuing motion. As the actor swings through the lowest point of his motion, his speed is 6 m/s. Length R remains Constant. What is the initial speed of the actor? The attempt at a solution[/b] I think I have literally tried everything. I attempted to find theta between the two points and, if done correctly, got that to be 25.8 degrees. I then tried finding arc length, which came out to a crazy number. Then I tried using angular acceleration equations. THEN I tried calculating it using K+U(initial)=K+U(final), but I ran into troubles there when it came to "y".