Higher particle speed means a higher temperature.
Slower particle speed means a lower temperature.
To determine whether particles are going faster, slower, or staying the same speed in the indicated portions of the graph, we generally look at the slope of the graph or the temperature changes. However, since you didn't provide the actual graph, I'll give you general guidelines based on common scenarios in thermodynamic graphs:
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A→B: If the temperature increases, the particle speed is increasing; if the temperature is constant, the particle speed is staying the same; if the temperature decreases, the particle speed is decreasing.
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B→C: Similar to the above, if the temperature increases, the particle speed is increasing; if the temperature is constant, the particle speed is staying the same; if the temperature decreases, the particle speed is decreasing.
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D→C: If this transition involves a loss of temperature, particle speed is likely decreasing; if the temperature is constant, the particle speed is staying the same; if the temperature is increasing, the particle speed is increasing.
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E→D: Following the same logic, if this transition sees a drop in temperature, particle speed is decreasing; if it is constant, the particle speed is staying the same; and if it is increasing, the speed is increasing.
If you provide specific descriptions of the graph between the transitions, I can give you more precise answers!