What is the work done by the force of gravity when a 20.0-n weight is displaced vertically upward a distance of 3.0 m?

For this case we have that by definition, the work done is given by:

Where,

F: force in the direction of displacement d: displaced distance

Therefore, replacing values we have:

the work done by the force of gravity when a 20.0-n weight is displaced vertically upward a distance of 3.0 m is:

That would be kinetic energy

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.