Some people, each of mass m = 50 kg, walk around a construction site. What is the gravitational potential energy of a person standing at each location?

location              GPE 
------------------------------
   A        
   B
 
   C
   E

   F
   G
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Suppose that a person walks from one location to another. What is the change in his GPE? What is the displacement? (Use x-axis is positive to right, y-axis is positive going up) What is the component of the gravitational force acting with (+) or against (-) his motion?

           change in   displacement   component of grav
from   to    GPE (J)      (m)           force (N)
-----------------------------------------------------
  B    C
 
  E    F

  C    E
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