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
Correct Answer:
Verified
Correct Answer:
Verified
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