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T = 5/20 = 0,25 s
Panjang gelombang = 2 x 50 m = 100 m karena jarak puncak dan dasar yang berdampingan itu hanya setengah gelombang.
v = panjang gelombang/T
v = 100/0,25 = 400 m/s
semoga membantu yaa ^^