1. The problem statement, all variables and given/known data [PLAIN]http://img199.imageshack.us/img199/2586/physicshelp.jpg [Broken] 1. What is the time interval between the initial jump and when the center of mass reaches the maximum height? 2. Average horizontal velocity during the jump. 3. The time interval between the time when the center of mass was at the maximum height and the end of the jump. 2. Relevant equations I assume this would work as a projectile motion question, but I can't think of how to do it without having at least the angle or initial velocity. 3. The attempt at a solution I really don't know where to start. This isn't homework, it's a sample question for the specialized university entrance exam. (University of Sao Paulo Vestibular) --- I'm hoping this is easier than it looks and I'm just being dense. Thanks in advanced to whoever can give me a hand studying. I still have until November to get a grasp on this stuff and until January to actually master it. EDIT: I guess it is much easier than I though. So far I know the initial velocity and the time. That's question number one answered. I have to go now though so I'll see if I can finish later.