Every school-age kid has heard the prediction “What goes up must come down.” Many kids challenge it with a question relating to helium balloons. Some inquisitive and persistent kids have wondered what would happen if that object thrown up was going terrifically fast. Would it still come down? The first step that a physicist will take in analyzing what happens to an object thrown straight up at a high speed is to analyze what happens if it is thrown at a low speed. The object goes up, reaches a peak, and descends. If the throwing speed is increased, the object goes higher, stays in the air longer, and then returns to the ground. In this chapter, the authors refine this description.