What is most often given a value of 0 to describe an object's position on a straight line? displacement reference distance ending location

reference.

To describe the position on a straigh line (one dimension motion) it is very common to use reference 0, i.e. you describe the position from the origin.

For example, to describe the position of the house from the corner, you use the corner as the point 0, which is the reference, and so the position ot the house will be the distance from the corner (rerence 0).

This is the answer of your question