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Speed - definition, formula, Examples | Instantaneous speed | Average speed | velocity

Speed difination  - Speed is defined  as the rate at which a particle covers a distance along a given path. It is given by the ratio of dis...

Speed difination - Speed is defined as the rate at which a particle covers a distance along a given path. It is given by the ratio of distance travelled to the time taken.

Speed formula - Distance travelled (s)/Time (t)


Note
  • Since distance travelled is a scalar, the speed of a particle is also a scalar.
  • The unit of speed is cm s^-1 in C.G.S. system and m s^-1 in M.KS. or S.I. system.

Instantaneous Speed 

The speed of a particle at a given instant is known as instantaneous speed. The speedometer of a vehicle indicates the instantaneous speed of the vehicle.

Uniform Speed: A body or particle is said to possess uniform speed if it travels equal distances in equal intervals of time. 
Uniform speed maintained by a person from A to B 

Consider a person travelling from A to B through O. If he walks at a constant rate of 1 m s^-1, i.e., for every 1 s if he travels 1 m, then the person is said to possess uniform speed. Uniform speed indicates that the instantaneous speed of particle remains the same throughout the motion.
 
Variable speed: If the instantaneous speed of a particle changes with time, then the body is said to be moving with variable speed

Average Speed 

Average speed: Defined as the ratio of the total distance travelled to the total time taken by the particle to cover that distance. 

Average speed formula = Total distance/Total time 

Velocity: It is displacement of a body in unit time or rate of displacement. 

Velocity formula = displacement/time 

Velocity is a vector quantity. SI unit of velocity is m s^-1 and or C.G.S. unit of velocity is cm s^-1.