The acceleration of an object, starting from rest, is shown in the graph below. Other than at t = 0, when is the velocity of the object equal to zero? 
Definitions:
Census
A study of every member of a population.
Sampling Frames
Databases or lists that are used to define and select the sample in a research study for the purpose of making generalizations about a population.
Geographic Areas
are defined regions or spaces on the Earth's surface, which can be identified by physical features, political boundaries, or cultural characteristics.
Sampling Interval
The standard distance or time between samples when sampling a population.
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