If the block has a mass of 2 kg, and a pulling force of 20 N acting on the block causes it to accelerate at 4 m/s2, what is the value of the frictional force acting on the block?

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Questions below are based on the following figure, which shows a block being dragged across the floor.



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If the block has a mass of 2 kg, and a pulling force of 20 N acting on the block causes it to accelerate at 4 m/s2, what is the value of the frictional force acting on the block?