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v =
v = 350 kak jawabannya koreksi deh
frekuensi = 1/0.4 = 2.5 hz
cepat rambat(v) = f x lamda
2.5 x 140
= 350 m/s
kayaknya soal atau pilihannya ada yang salah
cara 2 : waktu = 0.4 s
jarak = 140 m
kecepatan = 140/0.4 = 350 m/s
sama saja jawabannya