The United States, like Japan, is experiencing an increasing number of aging people in the population. What is the main difference between the two? How does this benefit.

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.

Idont see a question here