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শব্দের বেগ `V` এবং শব্দবিস্তারের দিকে বায়ুপ্রবাহের বেগ `v` | শব্দের কার্যকর বেগ
A.  V
B.  V+ v
C. V-v
D. `sqrt((V^(2)+v^(2))`

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