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

Floor and wall both are smooth surfaces
Floor and wall both are rough surfaces
Floor is rough and the wall is smooth
Floor is smooth and the wall is rough

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Applied Mechanics and Graphic Statics
Free body diagram is an

None of these
Isolated joint with all the forces, internal as well as external, acting on it
Isolated joint with only body forces acting on it
Isolated joint with internal forces acting on it

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