A-3.0 nc charge is on the x-axis at x = -5.0 cm and a +4.0 nc charge is on the x-axis at x = 18 cm . at what point or points on the y-axis is the electric potential zero?

B) as the temperature increases, the kinetic energy of the particles increases.|-/

One splits the atoms and molecules  the other combines them

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.