Lila is a track and field athlete. She must complete four laps around a circular track. The track itself measures 400 meters from start to finish and the race took her 6 minutes to complete. Which best describes her speed and velocity?

Her speed is 4.4 m/s, and her velocity is 0 m/s.

Her speed is 1.1 m/s, and her velocity is 0 m/s.

Her speed is 0 m/s, and her velocity is 2400 m/s.

Her speed is 4.4 m/s, and her velocity is 4.4 m/s.

Her speed is 1.1 m/s, and her velocity is 0 m/s.

Explanation:

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In this case, since the speed is the defined as the distance traveled over the elapsed time:

And the velocity is defined as the change in displacement over the time interval:

Thus, since the total distance traveled was 400 m and the total time 6 mins (360 s), we compute the speed as:

And the velocity is 0 m/s because the initial point is the very same final point as the track was circular. Therefore the answer is Her speed is 1.1 m/s, and her velocity is 0 m/s.

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