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Question

A train takes 2 h to reach station B from station A, and then 3 h to return from station B to station A. The distance between the two stations is 200 km. Find : (i) the average speed, (ii) the average velocity of the train.

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Solution

Total distance D=200+200=400 km
Average speed |Vavg|=Total distanceTotal time
|Vavg|=4002+3=80 km/h
Displacement S=0
Average velocity Vavg=Total displacementTotal time
Vavg=02+3=0 km/h

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