A 50.2-kg skateboarder starts out with a speed of 1.96 m/s. He does 100 J of...

A 50.2-kg skateboarder starts out with a speed of 1.96 m/s. He does 100 J of work on himself by pushing with his feet against the ground. In addition, friction does -279 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 7.11 m/s. (a) Calculate the change (PEf - PE0) in the gravitational potential energy. (b) How much has the vertical height of the skater changed? Give the absolute value.

Expert Solution

since the frictional force is non conservative ( depends on path) , it will affect the net workdone by the skater and decreases the speed of the skater , in this question i applied work energy theorem to calculate the height changed and change in gravitational potential energy , height comes out to be negative , but it can be positive if we consider the skater initial position at the top

genius_generous answered 6 months ago

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