Question

An athlete completes one round of a circular track of diameter 40m in 12sec.
What will be the distance covered and the displacement at the end of 54sec.

Answer 1

Answer:

The distance covered in ONE round is pi * diameter = 125.66 m.

Assuming constant speed - his speed would have been 125.66m / 12 sec = 10.47 m/s

If he continued at that speed for 54 sec, he would have traveled a total distance (10.47 m/s) * (54 sec) = 565.5 m

Since one lap around the track is 125.66 m, in 54 seconds he would’ve completed (laps from his starting point) 565.5 m / 125.66 m = 4.5 laps.

His displacement is the distance difference between his stopping point and his starting point, which is approximately 0.5 laps. Since one lap is 125.66 m, his total displacement is approximately 125.66 m * 0.5 = 62.83 m.