The SI has 7 base units. These units can be combined in an almost unlimited way to form other (derived) units. The Wikipedia article on "SI derived units" lists some examples.
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What should you do to change a value in SI units to a value in U.S. customary units?
SI means "International System [of Units]" (from the French abbreviation).
they are units for scientist
http://physics.nist.gov/cuu/Units/units.html
The SI unit for velocity is m/s. Therefore the SI units for velocity squared would be m2/s2.