Question

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1) A stone is dropped into a well of 80m deep. The sound of splash is heard 4.2 sec after the stone dropped.


⊙ Then find the velocity of sound in air ?????



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$<font color = green><h1><marquee > prabhudutt$

Answer 1

very simple question !!



take the following steps into consideration :-


h = 80 m

now ,

we know that time taken by Free falling body is given by formula => √ 2h/ g

so , T comes out = √2× 80/10

T = 4 sec

now ,

spalsh herad = 4.2 sec

so ,


actual time => 4.2-4 sec




=> 0.2 sec .



now velocity => distance / time

=> 80m/.2 sec

=> 400m / s


hope it help you !!

thanks and all the best .

Answer 2

Answer:

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Explanation:

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