The figure shows the graph of the position x as a function of time for an object moving in the straight line (the x-axis) .Which of the following graphs best describes the velocity along the x-axis as a function of time for this object? 
Definitions:
Open Sentence
A statement or equation that contains one or more variables, which makes it neither true nor false until the variables are specified.
Variable
An element, feature, or factor that is liable to vary or change.
Closed Sentence
A statement or equation that contains no variables and is either true or false.
Variable
A component, attribute, or aspect that is subject to change or variation.
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