The coefficient of static friction between the block of mass mA and the horizontal surface is 0.40, whereas the coefficient of kinetic friction is 0.30. What is the minimum value of mA that keeps the system from falling? Hint: The tension force, call it FT, must be the same at both the string ends, and directed away from the blocks: Towards the right the tension applied to mA and upward the tension force applied to mB

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