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A sledder, starting from top of a hill, sliding down on a frictionless surface. He then...

A sledder, starting from top of a hill, sliding down on a frictionless surface. He then reaches a flat surface where his sled experiences friction until it comes to stop, as shown here Energy8.jpg. The sled makes 55-m skid mark on the flat surface. If the coefficient of kinetic friction of the flat surface is 0.2, from what height did the sledder start his journey?

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