QUESTION 1 A 20 kg block, resting on rough horizontal surface, is connected to blocks P and Q by a light
inextensible string, moving over a frictionless pulley. Blocks P and Q are glued together and
have a combined mass of m. A force of 35 N is now applied to the 20 kg block at an angle of 40°
with the horizontal as shown below.
35 N
20 kg
P
The 20 kg block experiences a frictional force of magnitude of 5 N as it moves to the RIGHT at a
CONSTANT SPEED.
(2)
Calculate the combined mass m of the two blocks

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. 

In atoms, the electron carries a negative elementary or unit charge; the proton carries a positive charge. the two types of charge are equal and opposite. in an atom of matter, an electrical charge occurs whenever the number of protons in the nucleus differs from the number of electrons surrounding that nucleus.