Standing on a building \(80\text{m}\) high, I threw a stone vertically upwards at a velocity of \(20\text{m/s}\). Then find the time(in seconds) it takes to reach the ground.

Details and assumption:-

- Take \(\text{g}\)(acceleration due to gravity) as \(10{\text{m/s}}^2\).
- Give your answer to two decimal places.

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