Kai was 200 meters north of the library when he remembered he had to return some books to the library. it took him 200 seconds to do the round trip. which best describes kai's roundtrip? his speed was 1 m/s, and his velocity was 0. his speed was 2 m/s, and his velocity was 0. his speed was 1 m/s, and his velocity was 1 m/s north. his speed was 2 m/s, and his velocity was 2 m/s south.

the answer is B

The correct option is 'his speed was 2 m/s, and his velocity was 0.'

Explanation:

In a Round trip the stating point and finishing point are the same.

The distance covered by Kai in 200 seconds = AB+BA =

200 m+200 m = 400 m

Speed of the kai =

Displacement = shortest path covered = AB - BA = 200 m - 200 m =0 m

Velocity of the kai =

Hence, the correct option is 'his speed was 2 m/s, and his velocity was 0.'

thermal energy is the answer