Question 6: What is the displacement of the train from time t = 0s until t = 50s? Question 7: What is the total distance traveled by the train from time t = 0s until t = 50s? Question 8. What is the slope of the line during the time interval t = 45 to t = 50? Question 9: What does the sign of the slope in question 8 represent in terms of the motion of the train? Question 10: What is the average velocity of the train during the interval t= 0s to t = 50s? Question 11: Does the train’s average velocity during the interval t= 0s to t = 50 s provide a complete picture of the train’s motion during this time?.

No bc a lot of things r still theories n unproven

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. 

Well it depends on the object or substance