A sledder with a total mass 40.0 kg (including the sled) slides down a 10.0m hill that is 20◦ from the horizontal. i. Let the coefficient of kinetic friction be µK = 0.2. The velocity at the bottom of the hill is 5.5 m/s. What is the kinetic energy of the sledder at the bottom of the hill? ii. How much energy is lost due to friction?

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