Chapter 2 - Kinematics: Description of Motion - Learning Path Questions and Exercises - Exercises - Page 60: 1

The radius of the track is 150 m. So, going halfway around the track would make the displacement just be the diameter. The diameter is 2 multiplied by the radius, so the displacement is 300 m. When the car travels the full lap, it goes back to its starting position, so the displacement is 0.

displacement = (Final Position) - (Initial Position) Since the car traveled halfway, the displacement is the diameter. Diameter = 2 x radius Diameter = 2 x 150 m Diameter = Displacement = 300m.