The gravitational force between two objects is represented by the variable F. If the masses are both doubled and the distance is halved, what is the new gravitational force?

It's true it didin't work becouse britain continued trading with it's colonies and the system hurt economies of the countries that used it

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. 

Idon't  know if i got it wrong but i picked ( a )