Solved: A 55.0-kg skateboarder starts out with a speed of
Chapter 6, Problem 6.104(choose chapter or problem)
A 55.0-kg 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 nonconservative. 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? c
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