A Vaulter Holds A 31 67 N Pole In Equilibrium By Exerting An Upward Force U With

A vaulter holds a 31.67-N pole in equilibrium by exerting an upward force U with her leading hand and a downward force D with her trailing hand. Point C is the center of gravity of the pole, a=0.750 m, b=1.63 m, c=2.03 m. What is the magnitudes of U?

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