The tower crane is used to hoist a 2000 kg load upward at constant velocity. The 1500 kg jib BD and 500 kg jib BC have centres of mass at G1 and G2, respectively. The centre of mass for the counterweight is located at G3. Determine the required mass of the counterweight C so that the resultant moment produced by the load and the weight of the tower crane jibs about point A is zero.

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