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A cyclist starts from the point $P$ of a circular ground of radius $2 \mathrm{~km}$ and travels along its circumference to the point $\mathrm{S}$. The displacement of a cyclist is:
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The correct answer is:
$\sqrt{8} \mathrm{~km}$
$\therefore$ Displacement $=\mathrm{R} \sqrt{2}=2 \sqrt{2}=\sqrt{8} \mathrm{~km}$
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