Question

A car runs at a constant speed on a circular track of radius $200\text{m}$, taking $62.8\text{s}$ on each lap. Find the average velocity(in $m/s$) and average speed(in $m/s$) respectively in each lap.

• A. 20 and zero
• B. 0 and 20
• C. 20 and 20
• D. 6.3 and 20

Answer 1

The correct option is B 0 and 20

Average velocity on each lap will be zero, because displacement is zero at the end of each lap.
$\text{Average speed}=\frac{2\pi r}{t}=\frac{2\pi \times 200}{62.8}=20m/s$