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A person trying to lose weight (dieter) lifts a 10 kg mass through 0.5 m, 1000 times. Assume that thepotential energy lost each time she lowers the mass is dissipated. (a) How much work does she do againstthe gravitational force? (b) Fat supplies 4 x 107 J of energy per kilogram which is converted to mechanicalenergy with a 20% efficiency rate. How much fat will the dieter use up? (use g 10 m/s)100 Ni m-1 as

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