Question

Lila is a track and field athlete. She has to complete four laps around the track, which id 400 meters. The race took her 6 minutes to complete which best describes her speed and velocity

Answer 1

the answers would be her speed is 4.4 m/s and her velocity is 0 m/s.

Answer 2

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

Step-by-step explanation:

Required formula :

$\text{speed}=\dfrac{\text{distance}}{\text{time}}$  (Scalar quantity)

$\text{velocity}=\dfrac{\text{displacement}}{\text{time}}$  (Vector quantity)

Given : The length of track = 400 meters

She has to complete four laps around the track.

Then , the total distance = $4\times400 = 1600$

Time taken yo complete race = 6 minutes = $6\times60 = 360\text{ seconds}$

[∵ 1 minute = 60 seconds.]

$\Rightarrow \text{speed}=\dfrac{1600}{360}=4.44\text{ m/s}$

i.e. Her speed is 4.4 m/s.

Also, when she completes each lap , the starting point is equal to the terminal point , it means the displacement would be zero.

$\Rightarrow\ \text{velocity}=\dfrac{0}{360}=0\ m/s$

Thus , her velocity is 0 m/s.

So the statement that best describes her speed and velocity : Her speed is 4.4 m/s, and her velocity is 0 m/s.