Question

An athlete completes one round of a circular track of radius $R$ in $40s$. His displacement at the end of $2$ minutes will be

• A. $2\pi R$
• B. $6\pi R$
• C. $2R$
• D. $Zero$

Answer 1

The correct option is D $Zero$

Time taken by the athlete to complete one round $T=40s$
Total time, t $=60\times 2=120s$
Round completed in $120s$
$n=\frac{t}{T}=\frac{120}{40}=3$
Athelete completes three rounds, so initial and final positions of the athelete are same, hence the displacement is $Zero$