We look at acceleration as the rate of change of speed.
Technically rate of change of velocity is acceleration. However speed and velocity are interchangeably used while problem solving, the vector property of motion is considered deliberately rather than as a rule.
In other words acceleration can be also called rate of change of speed.
...Sounds daaah.....that's why humanity is yet to make great leap in science...we are to understand light, gravity, etc....we are scared of precise definitions.
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magnitude of acceleration
displacement or distance.
Rate of change of position = speedIf you also reveal the direction of the speed, then you have velocity.
Acceleration is the time rate of change of speed. Acceleration = speed/time.
Velocity, which is different than speed in that it has a directional component to it.