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A 57.4-kg skateboarder starts out with a speed of 2.20 m/s. He does 113 J of...

A 57.4-kg skateboarder starts out with a speed of 2.20 m/s. He does 113 J of work on himself by pushing with his feet against the ground. In addition, friction does -224 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 8.70 m/s. Calculate the change (PEf - PE0) in the gravitational potential energy.

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