0 A rifle that shoots bullets at 460 m/s is to be aimed at a target 45.7 m away. If the centre of the target is level with
the rifle, how high above the target must the rifle barrel
be pointed so that the bullet hits dead 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. 

Ithink it’s: light bounce if off a mirror

The sun's gravitational pull is weaker on the planets that are closer to it, i think.