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Among the four graph shown in the figure there is only one graph for which average velocity over the time interval (O,T) can vanish for a suitably chosen T. Which one is it?
Explanation
If we draw a line parallel to time axis from the point (A) on graph at $t = 0\text{sec}$. This line can intersect graph at B. In graph (b) for one value of displacement there are two different points of time. so, for one time, the average velocity is positive and for other time is equivalent negative. As there are opposite velocities in the interval 0 to T hence average velocity can vanish in (b). This can be seen in the figure given below. Here, $OA = BT$ (same displacement) for two different points of time.