Which of the following gives the magnitude of the average velocity (over the entire run) of an athlete running on a circular track with a circumference of 0.5 km, if that athlete runs a total length of 1.0 km in a time interval of 4 minutes? a. O m/s
b. 2 m/s
c. 4.2 m/s
d. 16.8 m/s

c. 4.2 m/s

Explanation:

The definition of the average velocity, measured in meters per second, is given by the following expression:

Where:

, - Initial and final positions, measured in meters.

, - Initial and final instants, measured in seconds.

Positions and instants must be written in meters and seconds, respectively:

, .

, .

Finally, the average velocity of the athlete that runs a total length of 1.0 kilometer in a time interval of 4 minutes is:

Hence, the best option is C.