Speed, Velocity and Acceleration are the three terms that matches the definitions.
Speed refers to the distance covered by an object per unit time. It is in other words refers to as Distance divided by time. The SI unit of Speed is m/s and it is a scalar quantity which has only magnitude but no direction.
It is mathematically referred to as,
Speed = Distance/Time
Velocity refers to the speed in specific direction. Velocity refers to the displacement made by an object in unit time. Its SI unit is similar to the SI unit of speed, that is m/s. It is a vector quantity. A vector quantity usually has both magnitude and direction.
The rate of change in the velocity refers to acceleration. It is simply the difference of final velocity and initial velocity divided by time. Its SI unit is m/s². It is mathematically represented as
Acceleration = (Final velocity - initial velocity)/Time
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