Question

quiz
multiple choice 0.5 points
where is the car stopped (v = 0)?
chart: x (meters) vs t, with points a, b, c, d, e
options:
between c and d
after point e (horizontal segment)
between a and b
nowhere

Explanation:

On a position-time (x-t) graph, velocity $v$ is the slope of the line segment, since $v=\frac{\Delta x}{\Delta t}$. A stopped car has $v=0$, which corresponds to a horizontal line segment (slope = 0). Looking at the graph, the segment after point E is horizontal, meaning no change in position over time (velocity = 0).

Answer:

After point E (horizontal segment)