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A 4 kg block is stacked on top of an 8 kg block. The blocks are...

A 4 kg block is stacked on top of an 8 kg block. The blocks are pulled horizontally by a rope attached to the bottom block. The force of the pull is 50 N and the coefficient of kinetic friction between the bottom block and the floor is 0.3. What is the acceleration of the two blocks? What is the minimum static friction coefficient necessary to keep the top block stacked to the bottom block?

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