Suppose the person in Active Example 11-3 climbs higher on the ladder. (a) As a result, is the ladder more likely, less likely, or equally likely to slip? (b) Choose the best explanation from among the following:
I. The forces are the same regardless of the person’s position.
II. The magnitude of f 2 must increase as the person moves upward.
III. When the person is higher, the ladder presses down harder on the floor.
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