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The top of a descending ski slope is 40 mm higher than the bottom of the slope. A 60-kgkg skier starts from rest and skis

The top of a descending ski slope is 40 mm higher than the bottom of the slope. A 60-kgkg skier starts from rest and skis straight to the bottom of the slope. 20% of the gravitational potential energy change of the skier is converted into internal energy (due to friction and air drag).

What is the skier's kinetic energy at the bottom of the slope?

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