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A 4.0 kg block is pushed along a horizontal floor by a force F of magnitude 31 N at a downward angle 0 = 40.

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A 4.0 kg block is pushed along a horizontal floor by a force F of magnitude 31 N at a downward angle 0 = 40. The coefficient of kinetic friction between the block and the floor is 0.26. Calculate the magnitudes of (a) the frictional force on the block from the floor and (b) the block's acceleration

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