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  4. An athlete completes one round of a circular track of radius R in 80 sec. What will be his displacement at the end of 4 min 60 second?

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Q. An athlete completes one round of a circular track of radius $R$ in $80$ sec. What will be his displacement at the end of $4$ min $60 $ second?

Motion in a Straight Line

Solution:

image
$\therefore $ Displacement is line segment $\mathrm{AB}$ $A B=\sqrt{R^{2}+R^{2}}=\sqrt{2} R$