When velocity is constant
The acceleration of a vehicle moving with uniform velocity is zero. This is because acceleration is the rate of change of velocity, and if the velocity is constant and not changing, then the acceleration is zero.
When an objects net force is zero, its acceleration is zero. No force , no acceleration.
I am not sure what you mean by reversing a zero acceleration. An object's acceleration can, of course, change over time.
When acceleration is zero, the object's velocity can still be changing if the initial velocity is not zero. However, if acceleration is zero and the initial velocity is also zero, then the object's velocity will remain constant.
The body is not zero, but the sum of all forces on it is. -- "Uniform velocity" means no acceleration. -- Acceleration is force/mass . -- If acceleration is zero, that's an indication that force must be zero.
If acceleration varies with time, it can of course AT ONE PARTICULAR INSTANT be equal to zero. However, it can't both change over time and remain at zero all the time.
Yes. For example a swinging pendulum has zero velocity at the turning point but acceleration is not zero.
"Acceleration" means change of velocity. If velocity is constant, then acceleration is zero.
If your acceleration is zero, then yes, you are traveling at a constant speed. The path does not matter. Acceleration measures the change in velocity, so an acceleration of zero means that there is zero change in velocity and therefore the speed is constant.
Acceleration being zero is equivalent to the statement that an object's velocity doesn't change.
Acceleration is the CHANGE in velocity; you're assuming CONSTANT velocity. So the acceleration is zero.
As long as acceleration is zero, the object's velocity is constant.