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b. banyak getaran = 5 menit/0,25s = 300s/0,25= 1200 getaran
2. a) f = n/t = 3000/2,5menit =3000/150s = 20 Hz
b) T = t/n = 150/3000 = 0,05 sekon
f : frekuensu
T : periode
n : banyaknya getaran
t : waktu yg diperlukan dlm beberapa getaran