2 kg aluminum plate, initially at 20 C, slides down at a 15 m long surface, incline at a 30 degree angle to the horizontal.

A 0.2 kg aluminum plate, initially at 20 C, slides down at a 15 m long surface, incline at a 30 degree angle to the horizontal. The force of kinetic friction exactly balances the component of gravity down the plane so that the plane, once started, glides down at constant velocity. If 90% of the mechanical energy of the system is absorbed by the aluminum, what is its temperature increase at the bottom of the incline? (Specific heat for aluminum is 900 J/kg*C.)

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