5. an athlete runs 5.4 laps around a circular track that is 400.0 m
long. if this takes 540 s, what is the average velocity of the athlete?
what is the average speed of the athlete over the complete
distance of the run?

Average velocity = 40 m/s

Average speed = 4 m/s

We are given;

We are required to calculate the average velocity and the average speed of the athlete.

#1. Average velocity of the athlete

In this case,

Thus;

Velocity = Displacement ÷ time

             = 160 m ÷ 40 s

             = 40 m/s

The average velocity of the athlete is 40 m/s

#2. Average speed of the athlete

Speed is a scalar quantity calculated by dividing distance by time taken.

In this case;

Total distance is 5.4 × 400 m = 2160 m

time taken is 540 s

Therefore;

Speed = Distance ÷ time

           = 2160 m ÷ 540 s

           = 4 m/s

Thus, the average speed of the athlete is 4 m/s

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explanation:

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.