In which of the following does personality psychology specialize?

a.

researching how people learn in educational settings and develop instructional tools

b.

studying how one’s character and temperament develops and changes over time

c.

focusing on resolving workplace issues to increase job satisfaction and productivity

d.

developing and implementing several programs to deal with health issues in society

B, Studying how ones' character changes over time... That's the only one that has to deal with personality. 

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.