EXERCISES: 4.1 Josh stored an electric potential energy of 2.5) in a vacuum of 1.00m' by a
field E. if the field is reduced to 1/4 of its initial value, how much energy is
stored per cubic meter.
a ka
Ans: 0.2J/m​

The third hammer 8 pounds

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. 

I’m not sure about this question