If Joe climbs the rope to Q, then 

        GPE(Q) - GPE(start)  =   + m g H   =   + 29,400 J


  If Joe walks along the ramp to R, then 

        GPE(R) - GPE(start)  =   + m g H   =   + 29,400 J


  If Joe walks along the ground to S, then 

        GPE(S) - GPE(start)  =   + m g 0   =   0 J