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If a set of given forces are such that their free vectors build a closed polygon, then | |
A. | the resultant force and resultant couple are always zero [Wrong Answer] |
B. | the resultant force is zero but resultant couple is not zero [Wrong Answer] |
C. | the resultant force is zero but resultant couple may not be zero [Correct Answer] |
D. | the resultant force and resultant couple both may not be zero [Wrong Answer] |