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Verified answer
Dik:f=680Hz
f=20Hz
v=340m/s
dit :v mobil?
penye:
v=fxh/2
1)cari h nya dulu
h=v.T
h=340×1/2
=680m
2)cari v nya
v=f/h
v=(f¹-f²)/680
=660/680
=0.970588235(dibulatkan jadi 0,1)
=10m/s (karena angka desimal dari 0,1 adalah 1/10)
semoga membantu:)