To determine whether either object has a constant velocity, we need to analyze the given position-time graphs.
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Object C: The graph is described as a concave up curve that slopes upward to the point (6, 32). Since the graph is concave up, this indicates that the velocity is changing (specifically, it is increasing). Therefore, object C does not have a constant velocity.
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Object D: The graph for object D is a dashed line that slopes upward from the origin (0, 0) to the point (6, 25). A straight line on a position-time graph indicates constant velocity. Therefore, object D does maintain a constant velocity.
Based on this analysis:
- Only object D has a constant velocity.