CBSE Class 9 Answered

diameter = 200m 

radius = 200/2 = 100 m

Distance covered = circumference of circular track

Thus, 

distance covered in 40 s= 2∏r = 2 x 3.14 x 100 = 628 m 

distance covered in 1 s = 15.7 m 

Thus, distance covered in 2 min 20 s i.e. 140 s = 15.7 x 140 = 2198 m ≈ 2200 m

 

Displacement in 2 mins i.e. 120 s will be zero because athelete will complete 3 rorunds and at that time initial position and final position will be same. 

But, after next 20 s the displacement will be equal to diameter of circular track which is 200 m 

 

Thus, 

distance covered = 2200 m and 

displacement = 200 m