Question

The motion of a car on a position-time graph is represented with a horizontal line. What does this indicate about the car’s motion?

It’s not moving.

It’s moving at a constant speed.

It’s moving at a constant velocity.

It’s speeding up.

Answer 1

The line on the graph stays at the same vertical height as it proceeds
from left to right. From the graph, this means that the car's position
doesn't change as time passes. That tells us that then car is not moving.