five kinematics equations

$$\tag{B1} \Delta x = \tfrac12 (v_1 + v_2) \Delta t, $$

$$\tag{B2} v_2 = v_1 + a \Delta t, $$

$$\tag{B3} \Delta x = v_1 \Delta t + \tfrac12 a t^2, $$

$$\tag{B4} v_2^2 = v_1^2 + 2 a \Delta x, $$

$$\tag{B5} \Delta x = v_2 \Delta t - \tfrac12 a t^2. $$