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74. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be | |
A. | downwards at its upper end [Wrong Answer] |
B. | upwards at its upper end [Wrong Answer] |
C. | perpendicular to the wall at its upper end [Wrong Answer] |
D. | zero at its upper end [Correct Answer] |
E. | none of the above. [Wrong Answer] |