Four changes + C + CMC-3.4K and +2410 are located respectively at the corners ABC
and o of the rectangle of sides 30 and toom
al calculate the net electric fielel (magnetulfe
and direction) at the centre of the rectangle
(2) What will be the sefultant force on the charge
+1.5 placed
at the centre

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. 

Answerigneous bedrock of the oceanic crust;