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1 gelombang= 2/8 = ¼ s
2,5 gelombang= 250 cm
1 gelombang= 250/2,5 = 100 cm= 1 m
v= s/t
= 1/¼
v= 4m/s
Jadi, jawabannya adalah A
maaf kalau salah, dan semoga bermanfaat :)