A Ladder Leans Against a Wall

question 39

Multiple Choice

A ladder leans against a wall.If the ladder is not to slip, which one of the following must be true?

• A)The coefficient of friction between the ladder and the wall must not be zero
• B)The coefficient of friction between the ladder and the floor must not be zero
• C)Both A and B
• D)Either A or B
• E)Neither A nor B

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Definitions:

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