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  4. An athlete participates in a race now he is moving on a circular track of radius 80 m completes half a revolution in 20 s. Its average velocity is:

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Q. An athlete participates in a race now he is moving on a circular track of radius $80\, m$ completes half a revolution in $20\,s.$ Its average velocity is:

Motion in a Straight Line

Solution:

Displacement $=2 \mathrm{R}$
$\mathrm{Time}=20 \mathrm{sec}$
(Average velocity $=\frac{2 \mathrm{R}}{20}=\frac{2 \times 80}{20}=8 \mathrm{~m} / \mathrm{s}$
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