Answer:
To find the displacement, we need to know his initial and final positions of the athlete him after 2 min. and 20 sec. Let's find the same, The athlete takes 40s to complete one revolution of a circular path. Total Time (t) = 2 minutes 20s = 140s Let n be the number of revolution he made \[n=\frac{140}{40}=\frac{7}{2}=3.5\] That means he made three and half revolutions in 140 seconds. So, he reached diametrically opposite of the starting point in a circle of radius 'r'. So, the displacement is \[r+r=2r.\]
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