In physics, speed is called the variation of the position of a body per unit of time. Velocity is a vector, that is, it has modulus (magnitude), direction and direction.

The magnitude of the speed, also known as speed or speed, is usually expressed as the distance traveled per unit of time (usually one hour or one second); it is expressed, for example, in kilometers per hour or meters per second.

When the speed is constant, it can be determined simply by dividing the distance traveled by the time taken. When an object is accelerated, its velocity vector changes over time. The acceleration can consist of a change of direction of the velocity vector, a change of its magnitude or both.

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