What is Speed? | What is Velocity? | What is Acceleration & Retardation?

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What is speed?

Speed is the rate of change of displacement with respect to its surrounding. It is a scalar quantity as the speed of the body is irrespective of its direction.

SI Unit: m/s 

Symbol: S

What is the velocity?

The rate of change of displacement with respect to its surrounding is called velocity, in a particular direction. It is a vector quantity as the velocity is always expressed in a particular direction. 

Formula: v = S / t 

Symbol: v = Velocity, S = Speed, t = Time

Unit: m/s

What are the acceleration and retardation?

The rate of change of velocity of the body is called acceleration. It is positive when the velocity of a body increases with time and negative when the velocity of a body decreases with time. The negative acceleration is called retardation. 

Formula: a = v / t 

Symbol: a =  Acceleration, v = velocity, t = time

Unit: m/s2

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