vilocity is a ____quantity
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The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north).
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The line which joins the initial and final position of object is called displacement. So , velocity is displacement per second. In a circular path, the velocity is always tangentially from the point in the path. And change in velocity is proportional to the force exerted on the body.
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