The tower crane is used to hoist the 2-Mg load upward at constant velocity. The 1.5-Mg jib BD, 0.5-Mg jib BC, and 6-Mg counterweight C have centers of mass al G1, G2, and G3, respectively. Determine the resultant moment produced by the load and the weights of the lower crane jibs about point A and about point B.
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