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jarak A-G = 45 cm
A-G membentuk 3 gelombang.
waktu dari A'-F' = 5s
A'-F' membentuk 2,5 gelombang
ditanya: v ..?
jawab:
panjang 1 gelombang (lamda) = 45/3 = 15 cm
periode (T) = 5/2,5 = 2s
v = lamda/T
v = 15/2
v = 7,5 cm/s