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  4. An athlete completes one round of a circular track of radius 10 m in 40 s. The distance covered by him in 2 minutes 20 seconds is

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Q. An athlete completes one round of a circular track of radius $10\, m$ in $40 \,s$. The distance covered by him in $2$ minutes $20$ seconds isPhysics Question Image

Motion in a Straight Line

Solution:

$\upsilon = \frac{2\pi r}{t}$
$= 2 \times \frac{22}{7} \times \frac{10}{40}$
$ = \frac{11}{7} m \, s^{-1}$
Distance, $S = \upsilon \, t$
$ = \frac{11}{7} \times 140$
$ = 220 \, m$