How to Interpret Velocity vs. Time Graphs?

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A horizontal line on a velocity vs. time graph indicates constant velocity, with 0 velocity meaning no motion, while a positive value indicates movement in the forward direction and a negative value indicates movement backward. A vertical line represents an instantaneous change in velocity, with the direction of the line indicating the nature of that change; a vertical line pointing up suggests a rapid increase in speed, while a line pointing down indicates a rapid decrease. The interpretation of positive and negative velocities depends on the specific setup of the experiment. Understanding these concepts is crucial for accurately analyzing motion in physics. Velocity vs. time graphs are essential tools for visualizing and interpreting motion dynamics.
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My physics lab is using a Motion Detector, to measure the time it takes for a high frequency pulse to travel from the detector to an object and back.

I have several questions about Velocity vs Time:

What does a horizontal line (with 0 velocity) mean? Does that mean to walk backwards, walk forwards, run, etc?

What does a horizontal line (with 0.5 velocity) mean? Does that mean to walk backwards, walk forwards, run, etc?

What does a horizontal line (with -0.5 velocity) mean? Does that mean to walk backwards, walk forwards, run, etc?

What does a vertical line pointing straight up mean? Quickly run backwards right?

What does a vertical line pointing straight down mean? Quickly run forward right?
 
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0 velocity means no motion.
What positive and negative means depends on your setup.

What does a vertical line pointing straight up mean? Quickly run backwards right?
It is a velocity versus time plot. So which quantity makes a fast change? How is that usually called?
 

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