Question

A car runs at constant speed on a circular track of radius $10m$ taking $6.28s$ on each lap. The average speed and average velocity on each complete lap is

• A. Velocity $10m/s$, speed $10m/s$
• B. Velocity $0$, speed $10m/s$
• C. Velocity $0$, speed $0$
• D. Velocity $10m/s$, speed $0$

Answer 1

The correct option is B Velocity $0$, speed $10m/s$

Since after each lap the position of the car is same as initial so the average velocity will be zero.
Total Distance $=2\pi r=2\times 3.14\times 10=62.8m$
Total time $=6.28s$
Average speed $=\frac{d}{t}=\frac{62.8}{6.28}=10m/s$