An idea map is a group chart that delineates how conceptual thoughts are connected. This sort of graphical perception device regularly utilizes circles or boxes to speak to ideas and associating lines to outline. The letter "x" is often used in algebra to mean a value that is not yet known. It is called a "variable" or sometimes an "unknown".
Answer:
h - height
Explanation:
gravitational potential energy = m * g * h
m stands for mass. Mass doesn't change in physics
g stands for gravitational acceleration. It is a constant.
h stands for height. When the skater moves up and down the track the height from the ground changes. Therefore this variable does change.
