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Block B has mass 4.00 kg and sits at rest on a horizontal, frictionless surface. Block...

Block B has mass 4.00 kg and sits at rest on a horizontal, frictionless surface. Block A has mass 2.00 kg and sits at rest on top of block B. The coefficient of static friction between the two blocks is 0.400. A horizontal force P⃗  is then applied to block A.

What is the largest value P can have and the blocks move together with equal accelerations?

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