1. The problem statement, all variables and given/known data A high jumper whose center of gravity is 1.1m above the ground h been clearing 1.8m using a western roll in which the take off velocity is at an angle 60deg with the horizontal. With what speed must be take off? how far back from the bar must he take off? I understand the question except for the 1.1m above ground center of gravity. What significance does this have? 2. Relevant equations kinematics 3. The attempt at a solution I cant proceed until I understand what the center of gravity is about.