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a 20 kg block moves on a horizontal surface. A force F that has a magnitude...

a 20 kg block moves on a horizontal surface. A force F that has a magnitude 80 N and direction 30.0 above the horizontal acts on the the block and the block slides along the surface. If the coefficient of kinetic friction between the block and the surface is Uk=20, what is the magnitude of the friction force that the surface exerts on the block?

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