Complete the statement. Assume that the gecko's mass did not change.
The gravitational potential energy stored between the gecko and Earth () as the gecko crawled on the window.

 - stayed the same
 - decreased
 - increased
Think about how the distance between the gecko and the center of Earth changed.
The top of the window is higher than the bottom of the window. As the gecko crawled toward the top of the window, the distance between the gecko and the center of Earth increased. So, the gravitational potential energy stored between the gecko and Earth increased as the gecko crawled on the window.