Distance Travelled:
To find the distance travelled by the athlete, we need to determine the circumference of the circular path. The formula to calculate the circumference of a circle is given by:

Circumference = π * diameter

Given that the diameter of the circular path is 200m, we can substitute this value into the formula:

Circumference = π * 200m = 628.32m (approx)

Therefore, the distance travelled by the athlete in one round of the circular path is approximately 628.32 meters.

Displacement:
Displacement refers to the change in position of an object. In this case, since the athlete completes one round of the circular path, the displacement would be zero.

Explanation:
When an object moves in a circular path and returns to its starting point, the displacement is always zero. This is because displacement is a vector quantity that is calculated as the straight-line distance between the initial and final positions of an object.

In the case of the athlete, after completing one round, the athlete ends up at the same position where they started. Therefore, the displacement is zero.

To visualize this, imagine drawing a straight line from the starting point to the ending point of the circular path. This line would be the displacement. However, since the starting and ending points are the same in a circular path, the displacement is zero.

In conclusion, the athlete travels a distance of approximately 628.32 meters but has a displacement of zero at the end of 30 seconds.

Distance travelled=πd
=(22/7)*200m
=4400/7m
=628.57m(approx)
magnitude of displacement =0
because after completing one round it's initial and final position are same.