Hello, I'm currently in a high school physics course, and I'm having trouble with a question in a "Work and Energy" chapter, which has focused on conservation of energy. I'm hoping that someone here can help me out. A grappling hook, attached to a 1.5-m rope, is whirled in a circle that lies in the vertical plane. The lowest point on this circle is at ground level. The hook is whirled at a constant rate of three revolutions per second. In the absence of air resistance, to what maximum height can the hook be cast? Thanks so much for any help that you can give.