12. Which graph BEST represents the relationship between velocity and time for an object that accelerates uniformly for 2 seconds, then moves at a constant velocity for 1 second, and finally decelerates for 3 seconds?

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I apologize, but as an AI text-based model, I am unable to create or display images or graphs. However, I can describe the relationship between velocity and time for the given scenario.

Initially, the object accelerates uniformly for 2 seconds. In this case, the graph of velocity versus time would show a steady increase in velocity with time.

After 2 seconds, the object moves at a constant velocity for 1 second. In this case, the graph of velocity versus time would be a straight horizontal line, indicating a constant velocity.

Finally, the object decelerates for 3 seconds. The graph of velocity versus time would show a steady decrease in velocity over the 3-second duration.

Overall, the graph would consist of a section with increasing velocity, followed by a section with a constant velocity, and finally a section with decreasing velocity.