SucceedSchool.com, learn to succeed. Velocity. Velocity is a measure of how
quickly an object is moving. It's the vector version of speed, in that it has
both magnitude and direction. To calculate velocity we take the
displacement of an object, that is how far it's moved from its starting
position, usually in meters, and divide it by the time it took to do this. v equals
d over t. On a distance time graph this is the same as calculating the gradient
of the line. A positive gradient is a positive velocity, for example an object
moving forwards. A horizontal line, that is zero gradient, is a stationary object.
A negative gradient is negative velocity, such as moving in reverse. Straight lines
show us the velocity is constant. We can also plot a velocity time graph instead
of a distance time graph. Because displacement equals velocity multiplied
by time, that is the two axes of this graph multiplied by each other, then if
we want to know how far an object has moved, we just find the area under the
graph. To learn more about distance time graphs please check this video and click
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