Final answer:
The question is related to Physics and focuses on the effectiveness of anti-skid systems, but the reference material provided does not contain specific information about the weight at which anti-skid is effective.
Step-by-step explanation:
The question appears to be about the effectiveness of anti-skid systems at various vehicle weights, typically related to automotive engineering, which falls under the subject of Physics. However, the provided reference materials deal with frictional forces and skiing, not directly with anti-skid technology and its relationship to vehicle weight. Therefore, while the question is related to Physics due to its connection to friction and motion, the specific weight (in KGS) where anti-skid is effective is not provided, making it impossible to answer accurately without further context or additional information regarding anti-skid systems.
Though the examples provided pertain to coefficients of kinetic friction and static friction, these topics relate to forces that oppose motion, which are relevant to understanding how anti-skid systems work. Anti-skid systems utilize the principles of friction to prevent wheel slip, thereby maintaining traction. They are designed to modulate brake pressure in real-time to maximize the braking force without exceeding the frictional limit between tires and the road surface, which is indeed a concept central to Physics.