The compound magnesium phosphate has the chemical formula mg3(po4)2. in this compound, phosphorous and oxygen act together as one charged particle, which is connected to magnesium, the other charged particle.
what does the 2 mean in the formula 5mg3(po4)2?
there are two elements in magnesium phosphate.
there are two molecules of magnesium phosphate.
there are two magnesium ions in a molecule of magnesium phosphate.
there are two phosphate ions in a molecule of magnesium phosphate.

The 2 means there are two phosphate ions in a molecule of magnesium phosphate.

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. 

It is 5 hope this you out