A 6-meter long rigid rod with a mass of 2 kg has small weights attached to its ends. The system is attached to a frictionless axle that passes through the rod 2 meters from the left end, as shown in the figure. When released from rest in a horizontal orientation, the system begins to rotate. What is its angular acceleration?​

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero.