With the assumption of no slipping, determine the mass m of the block which must be placed on the top of the 6-kg cart in order that the system period be 0.75 s. What is the minimum coefficient μ_s of static friction for which the block will not slip relative to the cart if the cart is displaced 50 mm from the equilibrium position and released?

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m 600 N/m WWW- 6 kg