Question

This is a line graph used to describe the motion of an object. A graphic representation of velocity. Also used to represent speed.

Answer 1

Based on all the information that can be discerned from the
graph provided with the question, it may, for all we know, depict
the gyrations of the New York Stock Exchange during World War II,
or possibility the thickness of the ozone layer in the Earth's atmosphere
over the past 77 years. 

It is almost certainly NOT a graphic representation of velocity, since it is
really tough to graph both speed and direction of a moving object.

Answer 2

The velocity-time graph is used to represent the displacement of an object over a given period of time

Generally, a straight line graph shows uniform motion of an object over a given a period of time.

The velocity-time graph is used to represent the displacement of an object over a given period of time. When direction of an object is not important, the same graph can be used to explain the speed of an object.

The area of the curve under velocity-time graph is known as displacement.

Thus, we can conclude that, velocity-time graph is used to represent the displacement of an object over a given period of time.

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