A Olympic athlete in the long jump goes into the jump at 12 m/s and launches himself at 20$\degree$ above the horizontal. How long is he in the air before returning to Earth?

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The Answer of A Olympic athlete in the long jump goes into the jump at 12 m/s and launches himself at 20$\degree$ above the horizontal. How long is he in the air before returning to Earth?

A Olympic Athlete in the Long Jump Goes into the Jump