A 2.0 kg mass is tied to a 4.0 kg mass with string B. The 2.0 kg mass is pulled forward with a force of 12 N by string A and both masses accelerate together. Find the acceleration and tension in string B if the surface is frictionless .

Find the acceleration and tension in string B if coefficient of kinetic friction is 0.10

The modern-day generator works on the principle of electromagnetic induction discovered by michael faraday in 1831-32. faraday discovered that the above flow of electric charges could be induced by moving an electrical conductor, such as a wire that contains electric charges, in a magnetic field.

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. 

B) erini just took the test and it is correct