1) The picture shows a van and a car traveling in the same direction. The 500 kg van going right at 5.0 m/s bumps into a 400 kg car moving in
the same direction at 2.0 m/s. The car has a final speed of 4.0 m/s.
What is the final velocity of the van? Assume there are no net external
forces and thus, momentum is conserved during the collision.

A)
2.5 m/s
B)
3.0 m/s
C)
3.4 m/s
D)
4.3 m/s

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) both involve the use of levers;