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7. 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 [Wrong Answer] |
B. | the floor is rough, the wall is smooth [Wrong Answer] |
C. | the floor and wall both are smooth sur¬faces [Correct Answer] |
D. | the floor and wall both are rough sur-faces [Wrong Answer] |
E. | will be in equilibrium under all condi-tions. [Wrong Answer] |