September 2018 1 53 Report
Sbuah mobil ambualns sambil mmpunyai sirine bergerak sling mnjauh d mbil sedan yg kecepatannya 40 m.s min1. jika frekuensi sirine yg didengar olh pengemudi mbil sdan 400Hz dn frekuensi sirine yg ditimbulkan olh mbil ambualns 500 Hz dan cepat rambat bnyi di udara 340 m.s min1. maka kecepatan mbil ambulans adlh
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