October 2018 2 64 Report
Gema dari dalam sumur tertangkap kembali dipermukaan sumur 0,2 s sesudah bunyi dipancarkan kedasar sumur .jika cpat rambat bunyi di udara 330m/s ,kedalaman sumur tsb adalah (Pakai cara)
a.33
b 66
c.132
d.165
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