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:
Mental Rotation
The cognitive ability to rotate mental representations of two-dimensional and three-dimensional objects.
Mental Maps
Internal representations of physical locations, helping individuals navigate and understand spatial environments.
Propositional View
The propositional view is a perspective in cognitive science and philosophy that suggests that knowledge, thought, and mental activities are structured in propositions or statement-like entities.
Barbara Tversky
A cognitive psychologist known for her research in the fields of spatial reasoning and collaborative cognition.
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