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A 76-kg skateboarder grinds down a hubba ledge that is 3.0 m long and inclined at...

A 76-kg skateboarder grinds down a hubba ledge that is 3.0 m long and inclined at 21 ∘ below the horizontal. Kinetic friction dissipates half of her initial potential energy to thermal and sound energies.

What is the coefficient of kinetic friction between her skateboard and the ledge surface?
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