Differences between fundamental unit and derived unit (any two)

In 1995 a research group led by eric cornell and carl wiemann at the university of colorado successfully cooled rubidium atoms to the 20-200 nk temperature range. assuming (incorrectly) that the rubidium atoms behave liké particles of a classical ideal gas, calculate the rms speed of a rubidium atom at a temperature of 112.0 nk. in the experiments one particular isotope of rubidium was used, rubidium-87. the molar mass of this isotope is 86.91 q/mol. tries 0/20 submit answer

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?