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![A) At the beginning of the jump, the athlete's feet exert forces F 1... | Download Scientific Diagram A) At the beginning of the jump, the athlete's feet exert forces F 1... | Download Scientific Diagram](https://www.researchgate.net/publication/303092499/figure/fig3/AS:406351860781059@1473893241471/A-At-the-beginning-of-the-jump-the-athletes-feet-exert-forces-F-1-and-F-2-of-the.png)