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As represented by this velocity-time graph, this object is ____.
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Questions in this assignment pertain to both position-time and velocity-time graphs. When presented together, there is a strong probability that any confusion that a student has concerning the graphs will rise to the surface. As a first step in answering each question, make a mental note of which graph is being displayed. Then review the rules for that graph before looking for a reasonable answer. See Know the Law section.
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This is a velocity-time graph. The line is located in the positive region of the graph at all times. This is representative of an object that is moving in the positive direction. At first the line slopes upward and away from the v=0 m/s level. This represents the motion of an object which is speeding up. Finally, the line slopes downward toward the v=0 m/s level. This represents the motion of an object which is slowing down. The fact that the line changes its direction simply means that the acceleration changes from a positive acceleration to a negative acceleration. That is, the object was speeding up at first and slowing down near the end of the motion.
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Velocity-Time Graphs:
Velocity versus time graphs represent changes that occur in an object's velocity with respect to time. The slope of the line is the acceleration (change in velocity divided by the change in time) of the object.
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