10.9.Model:Model the skateboarder as a particle. Assuming that the track offers no rolling friction, the sum of the skateboarder’s kinetic and gravitational potential energy does not change during his rolling motion. Visualize: The vertical displacement of the skateboarder is equal to the radius of the track. Solve:The quantity gKU+is the same at the upper edge of the quarter-pipe track as it was at the bottom. The
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