A splash is heard 3.12s after a stone is dropped into a well 45 m deep. The speed of sound in air is [g = 10 ms-2]

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330ms-1

375ms-1

340ms-1

346ms-1

answer is B.

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Detailed Solution

remaining time = 3.12 - 3 = 0.12 secspeed = 45 /0.12 = 375 ms-1

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