This graph shows the angular velocity of a turntable as a function of time.What is its average angular acceleration between t = 2 s and t = 4 s? 
Definitions:
External Locus
A belief that one's successes or failures result from external factors beyond their control.
Cognitive Ability
The capacity to perform higher mental processes of reasoning, remembering, understanding, and problem-solving.
Need
A requirement necessary for an individual or organization to achieve a goal or address a problem.
Motivation
The process that initiates, guides, and maintains goal-oriented behaviors, influencing the desire and energy levels to continue engaging in a particular activity.
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