Physics

The correct answer is A. After completing one trip on a roller coaster, the roller coaster's displacement is zero.

Displacement is a vector quantity that represents the change in position of an object from its initial position to its final position. It takes into account both the distance and the direction of the motion. In this case, since the roller coaster completes one trip, it returns to its initial position, which means its final position is the same as its initial position. Therefore, the change in position, or displacement, is zero.

Option B, reference point, refers to a point used to determine the position of an object. It is not directly related...