A 60.6-kg skateboarder starts out with a speed of 2.39 m/s. He does 119 J of work on himself by pushing with his feet against the ground. In addition, friction does-218 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 9.46 m/s. (a) Calculate the change (PE, PEo) in the gravitational potential energy. (b) How much has the vertical height of the skater changed? Give the absolute value. (a) Number (b) Number Units Units
A 60.6-kg skateboarder starts out with a speed of 2.39 m/s. He does 119 J of work on himself by pushing with his feet against the ground. In addition, friction does-218 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 9.46 m/s. (a) Calculate the change (PE, PEo) in the gravitational potential energy. (b) How much has the vertical height of the skater changed? Give the absolute value. (a) Number (b) Number Units Units
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Transcribed Image Text:A 60.6-kg skateboarder starts out with a speed of 2.39 m/s. He does 119 J of work on himself by pushing with his feet against the
ground. In addition, friction does-218 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed
of the skateboarder is 9.46 m/s. (a) Calculate the change (PE, PEo) in the gravitational potential energy. (b) How much has the vertical
height of the skater changed? Give the absolute value.
(a) Number
(b) Number
Units
Units
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