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A stone dropped freely from the top of a building takes 2s to reach the ground find height of the building .take acceleration due to gravity 9.8ms per

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T = 2 seconds

equation of motion:  s = u t + 1/2 a t²
 s = 0 + 1/2 * 9.8 m/s² * 2²
   =  19.6 meters

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