Gets ! read the following list of objects: the water behind a dam, a fully wound watch spring, a swing moving back and forth, an object moving on earth's surface, a roller coaster cart when it hits the lowest point of the track which statement is correct? a swing moving back and forth and the water behind a dam have only kinetic energy. a fully wound watch spring and a swing moving back and forth have only potential energy. the water behind a dam and a roller coaster cart when it hits the lowest point of the track have only potential energy. an object moving on earth's surface and a roller coaster cart when it hits the lowest point of the track have only kinetic energy.