The splash is heard after 4.22 sec after the stone is dropped into a well of depth 78.4 m .the velocity of sounds is
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let stone take time t to reach to bottom
-78.4=0*t-1/2(g)t*t
t=4
time taken by sound is=4.22-4=0.22s
velocity of sound is = 7.4/0.22=356.36 m/s
-78.4=0*t-1/2(g)t*t
t=4
time taken by sound is=4.22-4=0.22s
velocity of sound is = 7.4/0.22=356.36 m/s
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