A4.20x10^3 kg delivery truck begins to roll back down a hill that is sloped at a 25.0 degrees angle with the horizontal. an average friction force of 4.00x10^3 n impedes the cars motion so that the cars speed at the bottom is 5.60 m/s. what is the length of the driveway?

Refer to this solution carefully. 

For me a person with a phd and who knows what there talking about.i know the chances of a radiation leak is low but if it does the area within a 96.3 mile radius would be unusable because of contamination

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.