To determine whether either object has a constant velocity, we need to analyze the graphs of each object:
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Object C: The graph is a concave-up function that slopes upward to the point (6, 32). Since the graph is concave up, it means that the velocity of object C is changing — it is accelerating. Thus, object C does not have a constant velocity.
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Object D: The graph is a straight dashed line from the origin to the point (6, 25). A straight line indicates a constant change; therefore, the object moves with a constant velocity.
Based on this analysis, the only object that has a constant velocity is object D.
The correct response is: Only object D has a constant velocity.