A runner makes one lap around a 200-m track in a time of 25 s. What were the runner’s average speed and average velocity?
Question
A runner makes one lap around a 200-m track in a time of 25 s. What were the runner’s average speed and average velocity?
Solution
The average speed of a runner is calculated by dividing the total distance travelled by the total time taken. In this case, the runner has travelled 200 m in 25 s. So, the average speed is 200 m / 25 s = 8 m/s.
The average velocity of a runner is calculated by dividing the displacement by the total time taken. In this case, since the runner ends up at the same place he started after making one lap around the track, the displacement is 0 m. So, the average velocity is 0 m / 25 s = 0 m/s.
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