To determine if either object has a constant velocity, we can analyze the characteristics of each graph:
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Object D: The graph for object D is a straight dashed line from the point (0, 0) to (6, 25). Because this line is straight, it indicates that the velocity is constant over the time interval, as a straight line on a position-time graph represents a constant rate of change in position.
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Object C: The graph for object C is a concave up curve that starts below object D and rises to (6, 32). The curvature of the graph indicates that the object's velocity is changing; specifically, because the graph is concave up, the object is accelerating (its position is increasing at an increasing rate) during the time interval.
Based on this analysis:
- Only object D has a constant velocity.
- Object C does not have a constant velocity because it is accelerating.
Therefore, the correct response is: Only object D has a constant velocity.