The figure shows the graph of the position x as a function of time for an object moving in the straight line (the x-axis) . Which of the following graphs best describes the velocity along the x-axis as a function of time for this object? 
Definitions:
Internal Validity
The extent to which a study establishes a trustworthy cause-and-effect relationship between a treatment and an outcome.
Institutional Review Board (IRB)
A committee that reviews and monitors research involving human participants to ensure ethical standards are maintained.
American Psychological Association (APA)
A leading scientific and professional organization representing psychology in the United States, dedicated to advancing the creation, communication, and application of psychological knowledge to benefit society and improve lives.
Ethical Guidelines
Set of principles designed to guide behavior and decision-making based on moral duties and virtues.
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