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Displacement: Shortest distance between two points is called displacement                                                                OR The displacement is a change in the position of body form its initial position to final position Unit:  SI unit of displacement is metre (m)                    Dimension:             The dimension of displacement is [L] VELOCITY: The time rate of change of displacement is known as velocity. It is a vector quantity. Its direction is along the direction of displacement. Mathematically...

System of units; S.I A complete set of units, both base and derived, for all kinds of physical quantities is called a system of units. In S.I units, seven quantities are chosen as base; their units are defined and accepted as standard units   SUPPLEMENTARY UNITS This class contains two units: the SI unit of plane angle, the radian, and the SI unit of solid angle, the steradian Considering that plane angle is generally expressed as the ratio between two lengths and solid angle as the ratio between an area and the square of a length. The supplementary units radian and steradian are dimensionless derived units These supplementary units may be used in expressions for derived units to facilitate distinguishing between quantities of different nature but the same dimension Prior 1960, three measuring systems were in practice