Pathfinder Impulse & Momentum MCQ 6

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Top of a block A of mass 4 kg consists of a frictionless slope of height 40 cm which smoothly merges into a horizontal flat portion. The block rests on a frictionless horizontal floor. When a small block B of mass 1.0 kg is released on the top of the slope, it slides down the slope of the top of the block A. Find the coefficient of friction between the block B and horizontal portion of the top of the block A.