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    Motion in Straight Line
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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 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 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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    Define speed.

    Speed of an object is defined as the time rate of change of position of the object in any direction. 

    Speed is measured by the distance travelled by the object in unit time. 
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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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