what is difference between:
1) speed-velocity
2) acceleration-retardation

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Solution

Speed : Rate of Change of distance. (distance/time) It is a scalar quantity.
Velocity: Rate of change of displacement (Displacement/Time) It is a vector quantity.

Acceleration:
It is defined as change in velocity/time taken for change.
Retardation:
Negative acceleration is called as Retardation.

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