Determine the mass of the object below to the correct degree of precision. --
Place the object on the tray and
determine its mass by moving the slides
The slides can be moved using the
mouse and the left and right arrow keys.
Click to begin
358.3g
359.20g
358.30g
358.2g

For this question place the object on the scale and move the slides to change the mass until it is level. That will tell you the mass.

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. 

Amagnetic field "does not" interact with stationary electric charges. so, a.hope my answer you : )