These are called derived units. In the SI system (or metric system), there are base units for length, mass and time, among others. These are:
The unit of acceleration is expressed as m/s2. An example of a derived unit is the unit of force called the newton (N). Force is equal to mass multiplied by acceleration. Therefore:
force = mass × acceleration
N = kg·m/s2
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The units that are Obtained by combining other units is called Derived Units.
Density
A calculated measurement is a measurement obtained by using mathematics rather than physically measuring something. An example would be using the Pythagorean Theorem to calculate the measurement of the hypotenuse of a right triangle based on the lengths of the other two sides. A calculated answer is an answer carefully thought out in advance in response to a question. It is the opposite of a spontaneous answer given without forethought.
you will use cm because it is useful then the other types of measurement
newtons is a measurement of weight where as meters is a measurement of length they can not be measured into each other in other words the porblem is impossible to find an answer to