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

Protons and neutrons are found within the nucleus of an atom

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?