In constant velocity, acceleration is zero but in constant acceleration, velocity and acceleration are not zero.
A constant velocity of an object ensures that the rate of change of velocity with time is null, and hence, the acceleration of the object is zero.
A constant acceleration of an object ensures that the velocity of the object is changing continuously with time, and the velocity will not be constant.
Thus, in constant velocity, acceleration is zero but in constant acceleration, velocity and acceleration are not zero.
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