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Rate of change in position is called velocity.
Rate of change of position = speedIf you also reveal the direction of the speed, then you have velocity.
velocity
"Rate of change" means how quickly something changes. Examples in physics include a speed as a rate of change of position - if your position changes 10 meters every second, then that (10 meters/second) is your rate of change of position, or your velocity. Or if your income increases by a thousand dollars a year, then that's the rate of change of your income - how quickly your income changes.
To find rate of change. Two common examples are: rate of change in position = velocity and rate of change of velocity = acceleration.