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Q.

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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a

330ms-1

b

346ms-1

c

340ms-1

d

375ms-1

answer is B.

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Detailed Solution

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time of fall =2hg⇒t=2×4510=3

remaining time = 3.12 - 3 = 0.12 sec

speed = 45/0.12 = 375ms-1

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