question_answer 29)

                Among the four graphs (Fig.), 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?                 (a)                   (b)                 (c)             (d)                

Answer:

(b)  \[{{\vec{\upsilon }}_{av}}\,=\,\frac{\vec{x}(T)\,-\,\vec{x}(0)}{(T-\,0)}\]