When a task involves climbing. a slope of 10ํ gives the best efficiency. The following heights can be reached for an outlay of 42 work kJ:
On a ladder at 90 11.5 m
On a ladder at 70 14.4 m
On a staircase at 30 13.2 m
On a path at 25 13.1 m
On a path at 10 15.5m