1. An elevator (mass 4700 kg) is to be designed so that the maximum acceleration is 6.80×10-2. What is the maximum force the motor should exert on the supporting cable? Force Diagram: Force Tension | elevator | mg 3. FT = ma + mg 4700[(0.068(-9.8) - 9.8)] = -435178.8N but the answer should be positive. Why isn't gravity negative?