An object is moving in a straight line along the x-axis. A plot of its velocity in the x direction as a function of time is shown in the figure. Which graph represents its acceleration in the x direction as a function of time? 
Definitions:
Pain Matrix
A distributed network of brain regions, including the thalamus and anterior cingulate cortex, thought to respond to many types of pain.
Thalamus
A brain structure serving as a central relay station for sensory information, excluding smell, directing it to appropriate areas of the brain for processing.
Amygdala
A part of the brain involved in emotions, decision-making, and emotional memories.
Epinephrine
A hormone and neurotransmitter, also known as adrenaline, involved in the body's fight-or-flight response, increasing heart rate, blood pressure, and energy supplies.
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