A 61.8-kg skateboarder starts out with a speed of 1.75 m/s. He does 80.4 J of work on himself by pushing with his feet against theground. In addition, friction does -221 J of work on him. In both cases, the forces doing the work are non-conservative. The final speedof the skateboarder is 9.19 m/s. (a) Calculate the change (PEF - PEo) in the gravitational potential energy. (b) How much has the verticalheight of the skater changed? Give the absolute value.(a) Number(b) Number iUnitsUnits

According to this theorem, the total work done on an object is equal to the change in its energy.…

Answered: A 61.8-kg skateboarder starts out with…

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