Question: A block slides frictionlessly over the floor. On this block is a second, smaller block of mass m . The coefficient of static friction between

A block slides frictionlessly over the floor. On this block is a second, smaller block of mass m. The coefficient of static friction between the block and the carriage is s, and the coefficient of kinetic friction c. The spring stiffness constant is k and point A is stationary.
Initially x=0 and the spring is relaxed, its length is its no-load length. The block below is moved very slowly at constant speed. For what value of x does the block slide on the carriage?

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