Four (R1 =500 S2, R2 =1000 S2, R3 =1000 S2 and R4 =800 S2) resistors are connected across a battery with open-circuit voltage of 16V, which has an
internal resistance of 200 S2, as is shown in Fig.1. A voltmeter of internal
resistance 2000 12 is connected across the fourth resistor, as is shown in the figure.
What is the reading on the voltmeter? Choose the one correct option.
A 1.90 V
E 4.48 V
B 5.16 V
F 5.80 V
С 3.04 V
G 6.40 V
D 3.88 V
H 1.02 V

Sorry i don’t know what to do

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.