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2 A block with a mass of 4 kg is sliding across a horizontal surface with an initial speed of 5 m/s. The presence of

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2 A block with a mass of 4 kg is sliding across a horizontal surface with an initial speed of 5 m/s. The presence of kinetic friction between the block and the surface results in a constant 4 N force acting on the block. How much work (in J) will be done by the force of kinetic friction on the block during the first 8 m travelled by the block? X (no answer)

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