Who named the cell and how did he come up with that name ?

Robert hooke, and he was looking at a slice of cork in a microscope, and seen that they looked like little jail cells, so, he named them cells

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.