4. A 3800 kg truck travels to the right at 12 m/s. The truck rear ends an 1800 kg SUV
moving in the same direction at 6 m/s. What will be the final velocity of the SUV if after the
collision the truck continues forward at 4.9 m/s?

Ithink d is the right answer. hope this !

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.