Question

A runner circles the track exactly 2 times for distance of 800m. it takes 4.0min. what is her average speed in m/s? what is her average velocity?

Answer 1

Calculation of average speed:

we are given

A runner circles the track exactly 2 times for distance of 800m

so, distance is

d=800m

it takes 4.0min

so, t=4min

we know that

1min =60 sec

we can change time into seconds

`t=4*60sec=240sec`

now, we can use speed formula

`s=(d)/(t)`

now, we can plug it

and we get

`s=(800)/(240)m/sec`

`s=3.3m/sec`............Answer

Calculation of average velocity:

we are given

A runner circles the track exactly 2 times for distance of 800m

so,

displacement =400-400=0m

it takes 4.0min

so, t=4min

we know that

1min =60 sec

we can change time into seconds

`t=4*60sec=240sec`

now, we can use speed formula

`v=(d)/(t)`

now, we can plug it

and we get

`v=(0)/(240)m/sec`

`v=0m/sec`............Answer