Speed is the distance travelled by an object, Rate of change of displacement is called velocity, Formula for average speed is total distance / total time, Formula for average velocity is u + v/ 2, Speed is represented with the letter ' v ', Acceleration is defined as the rate of change of velocity, The other name for deceleration is retardation, units of acceleration is m / s 2, C. G .S unit of velocity is cm / s, SI unit of speed is m /s,

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