Average speed from speed-time graph

Steps:

• Identify the total time interval on the x-axis of the graph.
• Calculate total distance by finding the area under the speed-time curve.
• Divide total distance by total time to get average speed.
• Compare result to given options.

Why C is correct:

• Average speed equals total distance divided by total time, yielding 3 m/s per the graph's area and duration.

Why the others are wrong:

• A: Underestimates by ignoring full area under curve.
• B: Matches partial area, not total distance.
• D: Overestimates by miscalculating time or area.

Final answer: C