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CBSE Class 9 Answered

A runner runs 1.0 km south, then 2.0 km east, then 1.0 km north, and then 2.0 km west to return to its starting point. This trip takes 50 minutes. What was the runner's average speed, and what was the runner's average velocity?
Asked by Topperlearning User | 08 Apr, 2014, 08:30: AM
answered-by-expert Expert Answer

Average speed =Total distance / Total time

Total distance = 1 + 2 + 1 + 2 = 6 km 
Time taken = 50minutes =50/60 hours=5/6 hours
Average speed = (6km) / 50 minutes

= (6 km) / (5 / 6)hours

 = 7.2 km/hour 
Displacement is zero, because the runner returns back to its starting point.
Total displacement = 0 
Therefore average velocity = 0  

Answered by | 08 Apr, 2014, 10:30: AM

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