*What is Speed, Velocity, Acceleration, and Retardation in Engineering Mechanics?***Speed**

It is the rate of change of displacement with respect to its surrounding. Since the speed of a body is irrespective of its direction, therefore it is a scalar quantity.

**Velocity**

It is also the rate of change of displacement with respect to its surrounding, in a particular direction. Since the velocity is always expressed in a particular direction, therefore it is a vector quantity.

**Acceleration**

It is the rate of change of velocity of a body. It is said to be

*; when the velocity of a body increases with time and it is*

**positive****when the velocity decreases with time.**

*negative*
The negative acceleration is also called

**.***Retardation*
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