An elevator is moving upward with constant acceleration. The dashed curve shows the position y of the ceiling of the elevator as a function of the time t. At the instant indicated by the dot, a bolt breaks loose and drops from the ceiling. Which curve best represents the position of the bolt as a function of time? 
Definitions:
Reliability
The degree to which an assessment tool produces stable and consistent results over time.
Hypothesis
A proposed explanation for a phenomenon, which can be tested through experimentation and research.
Positive Correlation
A connection between two variables where both variables shift in tandem.
Independent Variables
In experimental design, the variables that are manipulated by the researcher to observe their effect on dependent variables.
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