Cells move through the cell cycle, growing and dividing as they do. no cell will be able to continue through this cycle without the energy provided by this important molecule. that is

Mitochondria because this is the energy producer in the cell

When the ball is rising up, it gains kinetic energy. when the ball reaches the very top, it will have all potential energy, until it falls back down and gains it kinetic energy. finally when you catch the ball or it falls back down, it would have gained its potential energy back.