WAEC Physics 2015 Paper

Concept:Derived units are obtained by combining fundamental SI base units through multiplication or division.Explanation:The SI base units include the kilogram ($\mathrm{kg}$), metre ($\mathrm{m}$), and kelvin ($\mathrm{K}$).These are fundamental units because they are not expressed in terms of other units.The newton ($\mathrm{N}$), on the other hand, is a derived unit of force.It is defined using the base units of mass, length, and time.$$1\, \mathrm{N} = 1\, \mathrm{kg \cdot m \cdot s^{-2}}$$Because the newton depends on the kilogram, metre, and second, it is not a fundamental unit.Answer:D. $\mathrm{N}$