Walt ran 5 kilometers in 25 minutes, going eastward. what was his average velocity?

Average velocity = (displacement)/(time)

Since Walt ran in a straight line, the magnitude of his displacement

was equal to the distance he ran = 5 km.

(displacement) / (time) = (5 km east) / (25 min)

Average velocity = 0.2 km/minute east

That's also equal to 12 km/hour east

wavelength variability is the right one

they are non-matter

explanation:

they are non-matter. basically, any type of energy or any abstract concept is an example of something that does not matter. other examples include dreams, magnetism, radio, and hate