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in Physics by (74.2k points)
720 km/h বেগে অনুভূমিকভাবে গতিশীল একটি বিমান থেকে একটি শব্দ করা হলে ভূপৃষ্ঠ থেকে আসা প্রতিধ্বনি 15s পরে শোনা গেল। বায়ুতে শব্দের বেগ 1200km/h হলে, ভূপৃষ্ঠ থেকে বিমানটির উচ্চতা
A. 1km
B. 2Km
C. 4km
D. 8km

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