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7. Ablock of mass m, is kept over another block of mass m, and the systam rests on a horizontai surface (aOCshown in figure) A constant horizontal force 2F acting on the lower block produces an accelerationof the system, the two blocks always move together. (a) Find the coefficient of kinetic friction between thebigger block and the horizontal surface (b) Find the frictional force acting on the smailer block. (c) Find thework done by the force of friction on the smaller block by the bigger block during a displacement x of thesystem2F

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