A 55.0kg skateboarder starts out with a speed of 1.80 m/s. He does + 80.0 J of
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A 55.0kg skateboarder starts out with a speed of 1.80 m/s. He does + 80.0 J of work on himself by pushing with his feet against the ground. In addition, friction does  265 J of work on him. In both cases, the forces doing the work are neoconservative. The final speed of the skateboarder is 6.00 m/s.
(a) Calculate the change (∆PE = PEf  PE0) in the gravitational potential energy.
(b) How much has the vertical height of the skater changed, and is the skater above or below the starting point?
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a The work done by nonconservative forces is given by Equation as W nc KE PE so PE W n...View the full answer
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