Speed is a measure of how quickly something is moving. Usually when we are talking about speed, we mean average speed. This is the time that it takes to travel from one point to another divided by the distance travelled. So speed is expressed in units such as kilometres per hour (km/h) or metres per second (m/s). Velocity, however, is a vector quantity. It measures the direction of movement as well as the speed.
Speed is how fast an object is moving, while velocity is the rate at which an object changes position in a certain direction. Speed is calculated by the displacement of space per a unit of time. Velocity is calculated by the displacement of space per a unit of time in a certain direction. In short, velocity factors in direction, but speed does not.
Speed refers to how fast an object is moving. It is calculated by the displacement of space per a unit of time. Velocity refers to the rate at which an object changes position in a certain direction. It is calculated by the displacement of space per a unit of time in a certain direction.
This definition might sound the same, but there is a crucial difference. It deals with direction. Velocity deals with direction and speed does not. Let me give you an example.
If you were driving at 50 miles per hour to get to a store, you would say that your speed is 50 miles per hours. If you were driving in a circle and ended at the same place, you would say that your velocity is zero, because there was no directional gain. The key to remember is that velocity is a vector, which means there is a directional component.
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