Discussion
Ravi starts running on the ground from point A to point B which is at a distance of 90 meters and returns to point A through the same path within a minute. What is the average velocity of Ravi ?
Answer: D
The average velocity is 0.
Average velocity is total displacement divided by total time. Ravi runs 90 m to B and returns to A, so he ends where he began and his displacement is zero:
\[ \begin{aligned} v_{avg} &= \frac{\text{displacement}}{\text{time}} \\ &= \frac{0}{60} = 0 \end{aligned} \]
The 3 m/s option is his average speed, 180 m in 60 s, which uses distance instead of displacement. 2 m/s and 1 m/s match neither quantity.
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