A system comprised blocks,a light frictionless pulley,and connecting ropes is shown in the figure.The 9.0-kg block is on a perfectly smooth horizontal table.The surfaces of the 12-kg block are rough,with μ_k = 0.30 between the block and the table.If the 5.0-kg block accelerates downward when it is released,find its acceleration. A) 1.0 m/s² B) 1.2 m/s² C) 1.4 m/s² D) 1.6 m/s² E) 1.8 m/s²

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The Answer of A system comprised blocks,a light frictionless pulley,and connecting ropes is shown in the figure.The 9.0-kg block is on a perfectly smooth horizontal table.The surfaces of the 12-kg block are rough,with μ_k = 0.30 between the block and the table.If the 5.0-kg block accelerates downward when it is released,find its acceleration. A) 1.0 m/s² B) 1.2 m/s² C) 1.4 m/s² D) 1.6 m/s² E) 1.8 m/s²

A System Comprised Blocks,a Light Frictionless Pulley,and Connecting Ropes Is