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.

Explanation:

Required formula :

`\text{speed}=\frac{\text{distance}}{\text{time}}` (Scalar quantity)

`\text{velocity}=\frac{\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*400 = 1600`

Time taken yo complete race = 6 minutes =
`6*60 = 360\text{ seconds}`

[∵ 1 minute = 60 seconds.]

`\Rightarrow \text{speed}=(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}=(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.