Question

Figure (3-E6) shows x-t graph of a particle. Find the time t such that the average velocity of the particle during the period 0 to t is zero.

Answer 1

Consider the point B, at t = 12 sec At t = 0 ; s = 20 m and t = 12 sec s = 20 m So for time  interval 0 to 12 sec, Change in displacement is zero. So, average velocity = displacement/ time = 0.  The time is 12 sec.