Among the four graphs shown in the figure there is only one graph for which average velocity over the time interval (0,T) can vanish for a suitably chosen T. Which one is it ?

Among the four graphs shown in the figure there is only one graph for

1.	Among the four graphs shown in the figure there is only one graph for which average velocity over the time interval (0,T) can vanish for a suitably chosen T. Which one is it ?
Answer» Solution :In the graph (b), for ONE value of displacement, there are two timings. As a RESULT of it, for one time, the average velocity is POSITIVE and for one time is EQUAL but negative. Due to it the average velocity for timings (equal to time PERIOD) can vanish.