# Answer to Question #9776 in Mechanics | Relativity for yelona

Question #9776
1.what is velocity?
1
2012-05-22T07:42:09-0400
In physics, velocity is speed in a given direction. Speed describes only how fast an object is moving, whereas velocity gives both the speed and direction of the object's motion. To have a constant velocity, an object must have a constant speed and motion in a constant direction. Constant direction typically constrains the object to motion in a straight path. A car moving at a constant 20 kilometers per hour in a circular path does not have a constant velocity. The rate of change in velocity is acceleration. Velocity is a vector physical quantity; both magnitude and direction are required to define it. The scale absolute value of velocity is speed, a quantity that is measured in metres per second (m/s or ms&minus;1) when using the SI (metric) system.

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