1. The velocity begins increasing, then the acceleration of the velocity increases until it hits a certain speed. At this point the line is horizontal where the velocity/speed stays constant. Then the velocity rapidly decreases until the object stops moving completely. After a certain amount of time the car begins to accelerate at a negative rate, then at a point stays constantly traveling at a negative velocity.
2a. When traveling at a constant velocity, the line is represented as a horizontal line.
2b. When increasing in velocity (accelerating) the line is represented as a linear line with a positive slope.
2c. When decreasing in velocity, the line is represented as a linear line with a negative slope
2d. When the car is stopping, the line is represented as a linear line with a large negative slope, then a horizontal line when stopped.
3. When finding the slope of a motion graph, you are finding the acceleration of an object.