An object's position refers to its location at any given point in time. When we study
motion in one dimension, we define how far an object travels from its initial position
as its distance, d. Distance is a scalar: it has magnitude, or size, only. The basic unit of
distance is the meter (m). Average speed is defined as distance divided by time, and
it tells you how quickly an object's distance changes. To calculate the scalar quantity
average speed, you divide the scalar quantity distance by time
Consider the car trip graphed here. At what point(s) during the trip is the car
stopped?

A. S

B. U

C. S and W

D. W