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Kinematics

cyruseternity
in Classical Physics

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We know that avg speed and avg velocities can or cannot be equal....but how is the magnitude of instantaneous velocity always equal to that of inst speed...

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Ya i agree but thats true only for motion in a straight line....they r not equal when there is a change in direction...!!

At every time t an object will have an associated velocity vector, v(t). We define the speed of the object at time t as |v(t)|. It's a definition, so it's not really something you can ask "why" about.

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