Eventually, poor AJ loses his grip and begins to roll off HAWAC and then continues to roll (without slipping!) down a series of hills across campus toward the Fox River. How far down will AJ descend vertically before he reaches a speed of 580 rotations per minute? (Treat AJ like a solid sphere of diameter 58 cm. I = 2/5 * mr^2. Remember his mass is 20 kg and assume his fall started from rest.)