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

By h=ut+12at2, time of downward journey can be calculated then h/v is the time for upward journey of sound now solve

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