I described to you how the device worked. predicably, you want to ignore its actual functioning also, you're making it very obvious that you dont have the basic knowledge required to have this conversation. acceleration is the *rate of change in the velocity* of a mass. "to have constant velocity you need constant acceleration" is a nonsense statement. The acceleration of a mass at a constant velocity is zero. and maintaining a constant velocity as in a car (ie, against friction) requires force, not acceleration. we're done here 🙏