Why would you throw like that?

Standing on a building 80m80\text{m} high, I threw a stone vertically upwards at a velocity of 20m/s20\text{m/s}. Then find the time(in seconds) it takes to reach the ground.


Details and assumption:-

  • Take g\text{g}(acceleration due to gravity) as 10m/s210{\text{m/s}}^2.
  • Give your answer to two decimal places.
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