Question

an athlete completes one round of a circular track of diameter 49 m in 20 seconds calculate the distance covered and displacement at the end of 20 seconds

Answer 1

as the athletes is coming back to its starting position , the displacement will be 0

distance will be equal to the circumference
49/2=24.5 (radius )
circumference = 2πr
2×3.14 × 24.5
=153.86

Answer 2

Since,the athelete comes back to his original position,the displacement will be 0.
Distance=2πr=2×22/7×49/2=154m