Question

An athlete completes one round of a circular track of diameter 200 m in 40s. What will be the magnitude of displacement of the athlete at the end of 2 minutes and 20 seconds​

Answer 1

Answer:

314.16m

Explanation:

Length of ground =πD = 628.32 m Here D is diameter

So in 40 secs he can travel 628.32 m, in 2mins 20 secs, means in 140 secs he travels = (140/40)*(628.32) = 2199.12 m

For one round he can complete 628.32 m and for  3 rounds he can complete  1884.96m , so displacement = distance he traveled in given time- distance he can travel in 3 rounds to reach same point

Answer is 2199.12 - 1884.96 = 314.16 m