An object is thrown vertically into the air. Which of the following five graphs represents the velocity (v) of the object as a function of the time (t) ? The positive direction is taken to be upward. 
Definitions:
Psychosexual Development
A Freudian concept that describes how personality develops through stages centered on the sexual pleasure of different parts of the body.
Toilet Training
The process of teaching a young child to use the toilet for urination and defecation.
Fixation
An obsessive interest or feeling that may impede the development of more normal interests and social interactions.
Psychic Energy
A concept in psychoanalytic theory referring to the force, derived from instinctual biological drives, that motivates human behavior and mental activities.
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