On a position-time graph, why does the x-axis only show positive values?

Question

(1 point)
The x-axis shows time, and time cannot be assigned a negative value on a position-time graph.
The x-axis shows the motion of an object, and motion cannot be assigned a negative value on a
position-time graph.
The x-axis is a dependent variable, and a dependent variable cannot be assigned a negative
value on a position-time graph.
The x-axis shows position, and position cannot be assigned a negative value on a position-time
graph.

Answer 1

The correct answer is: The x-axis shows time, and time cannot be assigned a negative value on a position-time graph.

In a position-time graph, the x-axis typically represents time, which is always a non-negative quantity (0 and positive values) because time does not have a direction and cannot go backward in a traditional sense. In contrast, the y-axis represents position, which can have negative, positive, or zero values, depending on the reference point used for the position.