The rate of change of velocity of an object is constant. Its average velocity is:

Correct option is A

​$$\text{When an object moves with } \textbf{constant acceleration}, \text{ its average velocity } (v_{\text{avg}}) \text{ is given by the formula:}$$​$$v_{\text{avg}} = \frac{v_i + v_f}{2}$$

$$\text{where:}$$

$$v_i = \text{ initial velocity}$$

$$v_f = \text{ final velocity}$$​​​​​