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l = 55 cm = 5,5 m
g = 10 m/s2
szukane:
T = ?
T = 2TT * V(l/g)
T = 2 * 3,14 * V(5,5/10) = 6,28 * V0,55 = 6,28 * 0,74
T = 4,6 s