A heavy ladder resting on a floor and against a vertical wall may not

1.	A heavy ladder resting on a floor and against a vertical wall may not be in equilibrium, if
A.	floor is smooth and the wall is rough
B.	floor is rough and the wall is smooth
C.	floor and wall both are smooth surfaces
D.	floor and wall both are rough surfaces.
Answer» D. floor and wall both are rough surfaces.

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A heavy ladder resting on a floor and against a vertical wall may not be in equilibrium, if

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