Which force is most directly responsible for radioactive beta decay?

electromagnetic force

strong interaction

gravitational interactions

weak interaction

Answer;

weak interaction

Explanation;The weak force is one of the four fundamental forces that govern all matter in the universe (the other three are gravity, electromagnetism and the strong force).Weak interaction is the mechanism of interaction between subatomic particles that causes radioactive decay and thus plays an essential role in nuclear fission. Only weak interactions can cause the decay of fundamental particles.

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.