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An athlete takes 50s to go once around a circular path of radius 70m at a uniform pace. His speed is

$Speed=\frac{Dis\mathrm{tan}ce}{Time}\phantom{\rule{0ex}{0ex}}v=\frac{2\mathrm{\pi r}}{t}=\frac{2\times 3.14\times 70}{50}=8.8m/s$

Regards

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