what is the Force required for a steel wire to double it's length when it's area of cross section is one square cm and young modulus is 200G pa. As the length of the wire is double, the change in length is equal to its original length?​

Pretty sure the answer is b : )

Ithink your answer is d

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. 

Your answer would be false