A system of blocks and a frictionless pulley is shown in the figure.Block A has a mass of 2.0 kg and is on a rough horizontal surface for which μ_s = 0.40 between the surface and block A.The rope pulls horizontally on block A.Block C has a mass of 1.0 kg.An external force ,applied vertically to block A,maintains the system at rest as shown in the figure.What is the friction force on block A? A) 6.3 N B) 6.9 N C) 7.5 N D) 5.7 N E) 5.1 N

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The Answer of A system of blocks and a frictionless pulley is shown in the figure.Block A has a mass of 2.0 kg and is on a rough horizontal surface for which μ_s = 0.40 between the surface and block A.The rope pulls horizontally on block A.Block C has a mass of 1.0 kg.An external force ,applied vertically to block A,maintains the system at rest as shown in the figure.What is the friction force on block A? A) 6.3 N B) 6.9 N C) 7.5 N D) 5.7 N E) 5.1 N

A System of Blocks and a Frictionless Pulley Is Shown