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menghasilkan periode 5 sekon..
Maka, A-B-C-B = 15 sekon
Satu periode gerakan: A - B - C - B - A
Dit : Waktu (t) A - B - C - B = ......?
Jwb : t = ³/₄ x T
= ³/₄ x 20 s
= 15 s