To find the average velocity of the object over a given time interval, we use the formula for average velocity:

$v_{\text{avg}} = \frac{s(t_2) - s(t_1)}{t_2 - t_1}$

where $s(t)$ is the position function, $t_1$ is the start time, and $t_2$ is the end time.

Could you please provide:

1. The position function $s(t)$.
2. The specific time intervals $[t_1, t_2]$.

With this information, I can calculate the average velocity accurately.