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A horizontal force of magnitude 36.4 N pushes a block of mass3.81 kg across a floor where the coefficient of kinetic friction is0.640.

(a) How much work isdone by that applied force on the block-floor system when the blockslides through a displacement of 3.93 m across the floor?

(b) During thatdisplacement, the thermal energy of the block increases by 37.2 J.What is the increase in thermal energy of the floor?

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