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Q. The 2.20 kg, 20 cm diameter disk in the figure below is spinning at 280 rpm. How much friction force must the brake affect to the rim to bring the disk to a halt in 5.00 s?

Q. A 10.00 kg grocery is pushed 12.0 m along an aisle by a shopper who exerts a constant horizontal force of 40.0 N. a.) What work is done on the cart? b.)If all frictional forces are neglected, and the cart starts form rest, what is the grocery cart's final speed?

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