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T = 2 π √(L/g); de modo que T² = (2 π)² . L/g
Para el nuevo péndulo: T'² = (2 π)² . (L + 1,5 m) / g = T² + (2 π)² . 1,50 m / g
T'² = (2 s)² + 6 s² = 10 s²; T' = 3,16 s
Finalmente f ' = 1/3,16 s = 0,316 Hz
Saludos Herminio