A uniform meter rule is pivoted at 80 cm mark. two forced 0.2n and 0.5n are applied at 70cm mark and 90cm mark respectively. if the metre is kept in equilibrium by the forces, what is the height of the metre rule

Answer body lying face up ;

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.