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An athlete completes one round of a circular track of radius R in 40sec. What will be his displacement at the end of 3 min. 20sec?
Explanation
Total time of motion is 3 min$20\text{sec} = 20\text{sec}$. As time period of circular motion is 40sec so in 20sec athlete will complete 5 revolution i.e., he will be at starting point i.e., displacement = zero.