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P2 = F1 / 1/4 A1
P2 = 4 F1 / A1
P2 = 4 128000 / 16
P2 = 32000 Pascal
P2 = 32 kPa
Jadi, tekanan jika luas lantai dipersempit menjadi seperempat nya adalah 32 kPa.
Semoga membantu :)