Final answer:
George's rollerblading with constant negative velocity indicates no change in speed or direction, meaning his acceleration is zero. If George is slowing down, the acceleration would be positive.
Step-by-step explanation:
When George is rollerblading with a negative constant velocity, it means he is moving in the opposite direction of the chosen positive direction at a steady speed. Since his velocity is constant, there is no change in speed or direction, which indicates that his acceleration must be zero. If, however, the question implies that George's speed is decreasing (he is slowing down), and because he is moving in the negative direction, the acceleration would be positive, as acceleration is defined as the rate of change of velocity and is positive when the change in velocity is in the positive direction (slowing down when moving in a negative direction).