cyruseternity Posted November 4, 2014 Posted November 4, 2014 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...
elfmotat Posted November 4, 2014 Posted November 4, 2014 The magnitude of velocity is equal to speed by definition.
cyruseternity Posted November 4, 2014 Author Posted November 4, 2014 Ya i agree but thats true only for motion in a straight line....they r not equal when there is a change in direction...!!
elfmotat Posted November 4, 2014 Posted November 4, 2014 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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