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    Motion in Straight Line
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    Define instantaneous velocity.
    Instantaneous velocity is the velocity of the particle at any instant. It is measured as the limiting case of average velocity as the limit ∆t → 0.

                            ν=lim∆t→OΔxΔt=dxdt
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    Define velocity.

    Velocity is defined as the time rate of change of displacement of the object. It is also defined as the speed of an object in a given direction. 
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    Define variable velocity.
    A particle is said to be moving with variable velocity, if it undergoes unequal displacements in equal intervals of time. 
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    Define average velocity.
    The average velocity of an object is equal to the ratio of the displacement, to the time interval for which the motion takes place. 

    Mathematically it is given by, 

              Average velocity = Displacement Time taken 
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    Define uniform velocity.
    A particle is said to be moving with a uniform velocity, if it undergoes equal displacements in equal intervals of time. 
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