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All right /wsr/ bit of applied maths for you;

A stone is dropped from the top of a tower. In the last second of its motion it descends through a distance which is 1/4 of the height of the tower. Find the height of the tower to the nearest metre.
(taking gravity as 9.8m/s^2 and starting velocity as 0m/s)

The answer is apparently 273m but I'm too tired to do algebra I properly atm fml.
Putting in steps would be appreciated.