Final answer:
Vertical and horizontal are terms used in physics to describe motions and axes in two-dimensional motion. The vertical axis is represented by the y-axis, while the horizontal axis is represented by the x-axis. The motions along these axes are independent of each other.
Step-by-step explanation:
Vertical and horizontal are terms used to describe motions and axes in two-dimensional motion. In physics, motion in two dimensions can be separated into vertical and horizontal components. The vertical axis is usually represented by the y-axis, while the horizontal axis is represented by the x-axis. These axes are perpendicular to each other, and the motions along each axis are independent of each other.