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1) Velocity
    It is defined as "displacement per unit interval of time".
     Velocity,v = (Displacement) / time
2) Generally, acceleration is positive when the velocity increase with time and negative           when the velocity decreases with time.
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The velocity of a body is the distance traveled by the body in a specified direction in a unit time interval. It is a vector quantity.

Acceleration is positive when the velocity of body increases with time, whereas it is negative when the velocity of body decreases with time.
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