Question $3$A:

Draw the relative position vector, $r_{\frac{B}{A}}?$

Draw the relative velocity vector $v_{\frac{B}{A}}$ given the rod $AB$ is rotating in counterclockwise direction.

Write out $2$ forms of the relative velocity equation presenting velocity of $B$ when taking $A$ as the base point? Show the kinematic diagram for each equation?

Write out the equation of the acceleration of point $B$ when taking $A$ as the base point and show the kinematic diagram for this equation?