If a truck of mass 2.48e+3 kg on the road beside a frozen lake rescue a car of mass 790 kg that has skid onto the frictionless ice. The truck tows the car with a cable and we assume that the cable is massless, horizontal, and does not stretch). What is the tension in the cable when the first car is accelerating at 2.30~\text{m/s}^22.30 m/s 2 ?

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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.