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Question

At t = 0, a stone is dropped into a well in which the level of water is h below the top of the well. If v is velocity of sound, the time T measured from t = 0, after which the splash is heard is given by ?

Joshi sir comment

$B y h = u t + \frac{1}{2} a t^{2}, t i m e o f d o w n w a r d j o u r n e y c a n b e c a l c u l a t e d t h e n h / v i s t h e t i m e f o r u p w a r d j o u r n e y o f s o u n d n o w s o l v e$

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