September 2018 1 39 Report
Sbuah mbil ambulans sambil membnyikan sirine bergerak saling mnjauh dg mbil sdan yng kecepatnnya 40 m.s min1. jika frekuensi sirine yg didngar oleh pngemudi mbil sdan 400 Hz dan frekuensi sirine yg d timbulkan olh mobil ambulns 500 Hz dan cpat rambt bnyi diudara 340m.s min1.mka kcpatan mobil ambulans adlh
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