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Evil One drops Joe out a plane flying horizontally. After 2 seconds of thought, he throws a rock vertically down to scare Joe (even more).

Evil One drops Joe out a plane flying horizontally. After 2 seconds of thought, he throws a rock vertically down to scare Joe (even more). If the rock is moving 10 m/s faster than Joe when it passes by him, how many seconds after the rock is thrown does it pass by Joe? Give your answer to one significant figure. Use g = 10 m/s2

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