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g = 9,81 m/s^2 = 10 m/s^2
l = ?
T = 2pi pierwiastek z l/g ; podnoszę obustronnie do kwadratu
T^2 = 4pi^2 *l/g
T^2 *g = 4 pi^2 *l
l = T^2*g /4 pi^2
l = (1s)^2 *10 m/s^2 / 4(3,14)^2
l = 10 m/39,4
l = 0,25 m = 25 cm