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?

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

Total time take by him is 200 seconds.

The formula of speed is

The formula of velocity is

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

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

the answer to your question is tooth decay.

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.