A block with mass m 50 kg lies on a horizontal rough surface. A force F %3D = 40 N pointed 20° below the horizontal acts on the block without moving it. Determine the magnitude of the force of static friction on the block. 0 20° %3D O 23.5 N O 28.2 N O 18.7 N 37.6 N 14.3 N

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