Question

Kai was 200 meters north from his house when he remembered he had to take some books to the library. It took him 200 seconds to do the round trip. Which best describes Kai’s roundtrip?

Answer 1

Very fast.  He ran 2meters per second.  

Answer 2

Kai was running at the speed of 2 meter per second and the value of velocity is 0

Step by step explanation:

It is given that the distance between kai and his house is 200 meter. He remembered he had to take some books to the library. It took him 200 seconds to do the round trip.

He travel from his current location to his house after that he reach his current location.

Total distance covered by him is

`200+200=400`

Total time take by him is 200 seconds.

The formula of speed is

`speed=(distance)/(time)`

`speed=(400)/(200)`

`speed=2`

The formula of velocity is

`velocity=(displacement)/(time)`

Since Kai reached his current location therefore the displacement is 0.

`velocity=(0)/(200)=0`

Therefore, the speed of Kai was 2 meter per second and the value of velocity is 0.