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T² = 4π² * l/g
T² * g = 4π² * l
l = T² * gz /4π²
l = (20 s)² * 9,81 m/s² / 4 * (3,14)²
l = 400 s² * 9,81 m/s² / 4 * 9,86
l = 3924 m /39,44
l ≈ 99,5 m ≈ 100 m