Lila is a track and field athlete. She must complete four laps around a circular track. The track itself is a 400 meter track and it took her 6 minutes total to complete.
Which best describes her speed and velocity? (There are 60 seconds in 1 minute.)
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.
The correct answer is: Her speed is 4.4 m/s, and her velocity is 0 m/s.
Speed is a scalar quantity that measures how fast an object is moving, regardless of its direction. In this case, Lila's speed is 4.4 m/s, which is the total distance she covered (4 laps * 400 meters) divided by the total time it took her (6 minutes or 360 seconds).
Velocity, on the other hand, is a vector quantity that measures both the speed and direction of an object. In this case, since Lila is completing laps around a circular track, her starting and ending points are the same, so her displacement (change in position) is 0. Therefore, her velocity is 0 m/s.
So, the answer is: Her speed is 4.4 m/s, and her velocity is 0 m/s.