Correct Answer: Option C

Explanation

Average velocity = \(\frac{total speed}{total time}\)

Total distance = Area under the graph i.e area of trapezium = \(\frac{1}{2}\)(a + b) x h

= 0.5(6 + 10) x 10 = 80m

Total time = 10secs

Average velocity = \(\frac{total speed}{total time}\) = \(\frac{80}{10}\) = 8m/s 

so closest answer is 8.5m/s

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