Hello, I'm in high school and am in my second year of programming with Greenfoot. I just have a quick question. How can I make an object be removed from the world when it reaches the maximum height of a parabola? I know how to remove the object, I just don't know how to let the object know that it's at the top of the parabola. In this case, an object is being fired up from a cannon. Any help is appreciated!