A tradesman sharpens a knife by pushing it against the rim, Physics

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A tradesman sharpens a knife by pushing it against the rim

A tradesman sharpens a knife by pushing it against the rim of a grindstone. The 35 cm diameter stone is spinning at 200 rpm and has a mass of 18 kg. The coefficient of kinetic friction between the knife and the stone is 0.20. If the stone loses 10% of its speed in 10 seconds of grinding, what is the force with which the man presses the knife against the stone?

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