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

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1.	A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if______________?
A.	the floor is smooth, the wall is rough
B.	the floor is rough, the wall is smooth
C.	the floor and wall both are smooth surfaces
D.	the floor and wall both are rough sur-faces
E.	will be in equilibrium under all condi-tions
Answer» D. the floor and wall both are rough sur-faces

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