The third harmonic of an organ pipe that is open at both ends and is 2.25 m long excites the fourth resonant frequency above the fundamental in another organ pipe. Determine the length of the other pipe when A) it is open at both ends and B) when it is open at one end and closed at the other. The temperature is unknown, therefore the speed of sound is unknown.

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.