* Acceleration due to gravity (g): This is always directed downwards and has a value of approximately 9.8 m/s². It's the same regardless of the ball's velocity or position.
* Mass of the ball: The mass of the ball doesn't change as it moves up or down.
* Total mechanical energy (if air resistance is negligible): The sum of the ball's kinetic energy (energy of motion) and potential energy (energy due to position) remains constant. As the ball rises, it loses kinetic energy but gains potential energy, and vice versa.
Let me know if you have any other questions!
