A(n) 6.7 kg object moving at 4.6 m/s eastward has a one-dimensional elastic collision with
a(n) 10 kg object moving at 6.7 m/s in the
opposite direction.
What is the total kinetic energy of the two mass system after the collision?
Answer in units of J.

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. 

B) erini just took the test and it is correct