A 65 kg gymnast jumps onto a horizontal bar, and the coach stops the back-and-forth sway by

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Question:

A 65 kg gymnast jumps onto a horizontal bar, and the coach stops the back-and-forth sway by applying 15N of force to the front and 20N of force to the back of the gymnast. The horizontal bar provides 675N of upward vertical reaction force. What is the net external force acting upon the gymnast and the direction