Distance and Displacement Calculation
Distance and displacement are two important concepts in physics that describe the motion of an object. In this scenario, we have an athlete running along a circular path from a starting point to a point before completing the full circle.

Given Data:
- Radius of the circular path, R = 7m
- Athlete starts at a point 7m from the center (starting point)
- Athlete ends at a point 7m from the center (end point)

Distance Travelled:
- To calculate the distance travelled by the athlete, we need to find the circumference of the circle.
- The formula for the circumference of a circle is C = 2πR, where R is the radius.
- Substituting the given radius value, C = 2 x π x 7 = 14π meters.
- However, the athlete does not complete the full circle, so the distance travelled is less than the circumference.
- The distance travelled by the athlete is the length of the arc between the starting and ending points.
- This can be calculated using the formula for the length of an arc, which is given by L = θR, where θ is the angle subtended by the arc at the center of the circle.
- Since the athlete ends before completing the circle, we can calculate the angle θ using trigonometry.
- The angle θ = cos^(-1)(7/14) = cos^(-1)(0.5) = 60 degrees.
- Therefore, the distance travelled by the athlete is (60/360) x 14π = 7π meters.

Displacement:
- Displacement is a vector quantity that describes the change in position of an object.
- It is the shortest distance between the starting and ending points, along with the direction.
- In this case, the displacement of the athlete can be calculated as the straight-line distance between the starting and ending points, which is 14 meters.