An insulating rod having linear charge density = 52.0 µC/m and linear mass density = 0.100 kg/m is released from rest in a uniform electric field E = 135 V/m directed perpendicular to the rod. A vertical rod is labeled ", ". An electric field pointing from left to right, perpendicular to the length of the rod, is labeled vector E and is present on both the left and right sides of the rod.
(a) Determine the speed of the rod after it has traveled 2.50 m.
m/s

(b) How does your answer to part (a) change if the electric field is not perpendicular to the rod?

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.