Q
A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if______________?
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A
A. The floor is smooth, the wall is rough
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B
B. The floor is rough, the wall is smooth
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C
C. The floor and wall both are smooth surfaces
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D
D. The floor and wall both are rough sur-faces
Correct Answer:
C. C. The floor and wall both are smooth surfaces
