The suggested rate of change of distance is called velocity. Velocity is a vector quantity that describes both the magnitude (speed) and direction of motion. It is calculated as the rate of change of displacement with respect to time.
Acceleration, on the other hand, is the rate of change of velocity. It describes how quickly an object's velocity is changing. Acceleration can be positive (speeding up), negative (slowing down), or zero (constant velocity).
Speed, on the other hand, is a scalar quantity that refers to the magnitude of velocity without considering direction. It does not indicate the direction of motion and is not related to the rate of change of distance.