Acceleration is the change of velocity, with direction. Therefore slowing down is a change in veolcity, so is considered to be acceleration (just negative acceleration).
Of course. A car with brakes applied and slowing down has forward velocity and rearward acceleration.
Acceleration doesn't mean "speeding up". It only means that the speed or direction of motion, or both, are changing. Speeding up is positive acceleration in the direction you're moving. Slowing down is negative acceleration in the direction you're moving, or positive acceleration in the opposite direction.
When an elevator is moving downward, its acceleration changes to be negative, meaning it is slowing down.
The direction of acceleration in a moving car is in the direction of the change in velocity, either speeding up or slowing down.
This is a moving object that is slowing down.
Yes. If acceleration is opposite to the direction in which you're moving, then you're slowing down.
Acceleration is negative if the object is slowing down or moving in the opposite direction of the velocity vector.
If the positive direction was defined at the outset as the direction opposite to the direction in which the object happens to be moving just now, and the object is slowing down, then the acceleration is positive because, algebraically, the object's speed is increasing in the positive direction.
When a moving object is slowing down, i.e. its speed is decreasing.
Its slowing down (but still moving).
No, retardation refers to a negative acceleration, which means the object is slowing down. A zero acceleration means the object is moving at a constant velocity.
Acceleration = 0 because the car is moving at a STEADY velocity. It is neither speeding up, nor slowing down.