How did samuel morse revolutionize communication in the 1800s?
a. he invented the telephone.
b. he proved that steam could power machines.
c. he invented the electric telegraph.
d. he developed alternating current.

Samuel Morse invented the electric telegraph (before his time, there were optical telegraphs, which functioned within line of sight). Another contribution of his is the Morse Code, a Code used to code letters through the electric telegraph. 

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.