Question
For any arbitrary motion in space, which of the following relations are true: $\text{v}_{\text{average}}=\frac{[\text{r}(\text{t}_2)-\text{r}(\text{t}_1)]}{(\text{t}_2-\text{t}_1)}$ (The ‘average’ stands for average of the quantity over the time interval $t_1$ to $t_2$)