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t = 2 menit = 120s
f = ...?
n = ...?
Langkah 1 : mencari frekuensi
F = 1/T
F = 1/0,025
F = 40Hz
Langkah 2 : Mencari jumlah getaran
n = f x t
n = 40 x 120
n = 4800 getaran